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Klaus Fuchs

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Klaus Fuchs

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Klaus Fuchs
Police photograph of Klaus Fuchs ca. 1940
Born Emil Julius Klaus Fuchs
(1911-12-29)29 December 1911
Rüsselsheim, German Empire
Died 28 January 1988(1988-01-28) (aged 76)
Dresden, East Germany
Residence Germany
United Kingdom
United States of America
East Germany
Nationality German
Fields Theoretical physics
Institutions Los Alamos National Laboratory
Harwell Atomic Energy Research Establishment
Institute for Nuclear Research in Rossendorf
Alma mater University of Leipzig
University of Kiel
University of Bristol
University of Edinburgh
Doctoral advisor Nevill Mott

Emil Julius Klaus Fuchs (29 December 1911 – 28 January 1988) was a German-born British theoretical physicist and atomic spy who in 1950 was convicted of supplying information from the American, British and Canadian Manhattan Project to the Soviet Union during and shortly after the Second World War. While at the Los Alamos National Laboratory, Fuchs was responsible for many significant theoretical calculations relating to the first nuclear weapons and later the early models of the hydrogen bomb.

The son of a Communist Party of Germany (KPD). He went into hiding after the Reichstag fire, and fled to England, where he received his PhD from the University of Bristol under the supervision of Nevill Mott, and his DSc from the University of Edinburgh, where he worked as an assistant to Max Born.

After the Columbia University, in New York City, to work on the Manhattan Project. In August 1944 Fuchs joined the Theoretical Physics Division at the Los Alamos Laboratory, working under Hans Bethe. His chief area of expertise was the problem of implosion, necessary for the development of the plutonium bomb. After the war he worked at the Atomic Energy Research Establishment at Harwell as the head of the Theoretical Physics Division.

In January 1950, Fuchs confessed that he was a spy. He was sentenced to fourteen years' imprisonment and stripped of his British citizenship. He was released in 1959, after serving nine years and emigrated to the German Democratic Republic (East Germany), where he was elected to the Academy of Sciences and the Socialist Unity Party of Germany (SED) central committee. He was later appointed deputy director of the Institute for Nuclear Research in Rossendorf, where he served until he retired in 1979.


  • Early life 1
  • Refugee in Britain 2
  • Second World War 3
  • Post war 4
  • Value of Fuchs's data to the Soviet project 5
  • Later life 6
  • See also 7
  • Notes 8
  • References 9
  • Further reading 10
  • External links 11

Early life

Emil Julius Klaus Fuchs was born in Rüsselsheim, Grand Duchy of Hesse, on 29 December 1911, the third of four children of a Lutheran pastor, Emil Fuchs, and his wife Else Wagner. Fuchs was always known by his last given name, Klaus. He had an older brother Gerhard, an older sister Elisabeth, and a younger sister, Kristel. The family moved to Eisenach, where he attended the gymnasium, and took his abitur. At school, Fuchs and his siblings were taunted over his father's unpopular political views, which they came to share. They became known as the "red foxes", Fuchs being the German word for fox.[1]

Fuchs entered the

  • Visit the Cold War International History Project (CWIHP) for the full text of Alexander Vassiliev's Notebooks containing more information on Fuchs's involvement in espionage
  • FBI file on Klaus Fuchs
  • Klaus Fuchs's 1950 confession
  • on Fuchs, with photo
  • German Goncharov on: What the Soviets Learned From Klaus Fuchs
  • Klaus Fuchs at Carey Sublette's, which includes information about the specific information given by Fuchs to the Soviets from declassified KGB files
  • Venona: Soviet Espionage and the American Response (CIA publication), contains letter from agents in 1949 about Klaus Fuchs. Archive copy at the Wayback Machine

External links

  • Friedmann, Ronald (2006). Klaus Fuchs. Der Mann, der kein Spion war. Das Leben des Kommunisten und Wissenschaftlers Klaus Fuchs (in German). Rostock: Koch.  
  • Kojevnikov, Alexei (2004). Stalin's Great Science: The Times and Adventures of Soviet Physicists. London: Imperial College Press.   (discusses use of Fuchs's passed on information by Soviets, based on now-declassified files)

Further reading

  • Baylis, John (1995). Ambiguity and Deterrence: British Nuclear Strategy 1945–1964. Oxford: Clarendon Press.  
  • Goodman, Michael (July 2005). "Who Is Trying to Keep What Secret From Whom and Why? MI5-FBI Relations and the Klaus Fuchs Case". Journal of Cold War Studies 7 (3): 124–146.  
  • Greenspan, Nancy Thorndike (2005). The End of the Certain World: The Life and Science of Max Born. New York: Basic Books.  
  • Goncharov, German A. (1996). "American and Soviet H-bomb development programmes: historical background". Physics-Uspekhi 39 (10): 1033–1044.  
  • Hoffmann, Dieter (December 2009). "Fritz Lange, Klaus Fuchs, and the Remigration of Scientists to East Germany". Physics in Perspective 11 (4): 405–425.  
  • Holloway, David (1994). Stalin and the Bomb: The Soviet Union and Atomic Energy, 1939–1956. New Haven, Connecticut: Yale University Press.  
  • Laucht, Christoph (2012). Elemental Germans: Klaus Fuchs, Rudolf Peierls, and the making of British Nuclear Culture 1939–59. Houndmills, Basingstoke, Hampshire: Palgrave Macmillan.  
  • Moss, Norman (1987). Klaus Fuchs: the Man who Stole the Atom Bomb. New York: St. Martin's Press.  
  • Norris, Robert S.;  
  • Szasz, Ferenc Morton (1992). British Scientists and the Manhattan Project: the Los Alamos Years. New York: St. Martin's Press.  
  • Trenear-Harvey, Glenmore S. (2011). Historical Dictionary of Atomic Espionage. Lanham, Maryland: Scarecrow Press.  
  • Williams, Robert Chadwell (1987). Klaus Fuchs: Atom Spy. Cambridge, Massachusetts: Harvard University Press.  


  1. ^ a b c Moss 1987, pp. 4–8.
  2. ^ Williams 1987, p. 14.
  3. ^ Moss 1987, pp. 4–7.
  4. ^ a b c d Laucht 2012, pp. 83–85.
  5. ^ "Fuchs, (Emil Julius) Klaus (1911–1988)".   (Subscription or UK public library membership required.)
  6. ^ a b c d Moss 1987, pp. 10–12.
  7. ^ Moss 1987, pp. 12–13.
  8. ^ Moss 1987, pp. 19–20.
  9. ^ a b Williams 1987, pp. 17–18.
  10. ^ "[Lamphere to Gardner], "Emil Julius Klaus Fuchs", aka; Karl Fuchs," 26 September 1949, National Security Agency, Venona Collection at 49–029.".  
  11. ^ a b Williams 1987, pp. 16–18.
  12. ^ a b Moss 1987, pp. 17–18.
  13. ^ a b Moss 1987, pp. 21–26.
  14. ^ Williams 1987, pp. 33–34.
  15. ^ a b Greenspan 2005, pp. 238–239.
  16. ^ O'Connor, J. J.; Robertson, E. F. (July 2008). "Emil Klaus Julius Fuchs". University of St Andrews, Scotland. Retrieved 17 May 2013. 
  17. ^ Moss 1987, p. 43.
  18. ^ Moss 1987, p. 34.
  19. ^ Bernstein 2010, p. 43.
  20. ^ Rhodes 1995, pp. 51, 57, 63.
  21. ^ Laucht 2012, p. 204.
  22. ^ Moss 1987, pp. 46–47.
  23. ^ Rhodes 1995, pp. 103–105.
  24. ^ Williams 1987, pp. 70–73.
  25. ^ Rhodes 1995, pp. 117–119.
  26. ^ "The Fuchs-Nordheim model and pulsing characteristics".  
  27. ^ Bernstein 2010, pp. 43–46.
  28. ^ Rhodes 1995, p. 175.
  29. ^ Szasz 1992, pp. 35, 90–91.
  30. ^ Weinstein & Vassiliev 1999, pp. 186–187.
  31. ^ Trenear-Harvey 2011, pp. 74–75.
  32. ^ Norton-Taylor, Richard (13 June 2014). "The Spy Who Changed the World by Mike Rossiter – review".  
  33. ^ Laucht 2012, pp. 78, 101.
  34. ^ Laucht 2012, pp. 75–76.
  35. ^ Moss 1987, pp. 93–94.
  36. ^ a b Rhodes 1995, p. 259.
  37. ^ Rhodes 1995, pp. 244–246.
  38. ^ Rhodes 1995, pp. 300–301.
  39. ^ Goodman 2005, pp. 126–128.
  40. ^ Rhodes 1995, p. 377.
  41. ^ Goodman 2005, pp. 128–129.
  42. ^ Moss 1987, pp. 134–136.
  43. ^ Goodman 2005, pp. 130–131.
  44. ^ Williams 1987, pp. 124–126.
  45. ^ Rhodes 1995, pp. 411–412.
  46. ^ Rhodes 1995, pp. 425–428.
  47. ^ Rhodes 1995, pp. 479–481.
  48. ^ Holloway 1994, pp. 220–224.
  49. ^ Bernstein 2010, pp. 49–50.
  50. ^ Goncharov 1996, pp. 1033–1044.
  51. ^ Baylis 1995, p. 76.
  52. ^ Williams 1987, pp. 129–130.
  53. ^ Goodman 2005, p. 132.
  54. ^ Moss 1987, pp. 158–165.
  55. ^ Moss 1987, p. 184.
  56. ^ Laucht 2012, p. 79.
  57. ^ Hoffmann 2009, p. 416.
  58. ^ Reed 2008, pp. 52–53.
  59. ^ Norris, Bernstein & Zimmerman 2009, p. 296.
  60. ^ Norris, Bernstein & Zimmerman 2009, p. 293.
  61. ^ Laucht 2012, p. 175.
  62. ^ Pace, Eric (29 January 1988). "Klaus Fuchs, Physicist Who Gave Atom Secrets to Soviet, Dies at 76".  
  63. ^ "Klaus Fuchs". Soylent Communications. Retrieved 29 April 2013. 


See also

In 1959, Fuchs married a friend from his years as a student communist, Margarete Keilson. He continued his scientific career and achieved considerable prominence. He was elected to the Academy of Sciences and the SED central committee and was later appointed deputy director of the Institute for Nuclear Research in Rossendorf, where he served until he retired in 1979. He received the Patriotic Order of Merit, the Order of Karl Marx and the National Prize of East Germany.[61] He died in Berlin on 28 January 1988 and was buried in its Friedrichsfelde Cemetery.[62][63]

Fuchs was released on 23 June 1959, after serving nine years and four months of his sentence (as then required in England where long-term prisoners were entitled by law to one-third off for good behaviour in prison) at Wakefield Prison and promptly emigrated to the German Democratic Republic (East Germany).[57] A tutorial he gave to Qian Sanqiang and other Chinese physicists helped them to develop the first Chinese atomic bomb, the 596, which was tested five years later according to Thomas Reed and Daniel Stillman, the authors of The Nuclear Express: A Political History of the Bomb and Its Proliferation (2009).[58] Three historians of nuclear weapons history, Robert S. Norris, Jeremy Bernstein, and Peter D. Zimmerman, challenged this particular assertion as "unsubstantiated conjecture"[59] and asserted that The Nuclear Express is "an ambitious but deeply flawed book".[60]

Fuchs's espionage likely cancelled an Anglo-American plan in 1950 for Britain to receive American-made atomic bombs.[51] He was prosecuted by Sir Hartley Shawcross,[52] and was convicted on 1 March 1950 of four counts of breaking the Official Secrets Act by "communicating information to a potential enemy".[53] After a trial lasting less than 90 minutes, Lord Goddard sentenced him to fourteen years' imprisonment, the maximum for espionage, because the Soviet Union was classed as an ally at the time.[54] In December 1950 he was stripped of his British citizenship.[55] The head of the British H-bomb project, Sir William Penney, visited Fuchs in prison in 1952.[56]

The grave of Klaus Fuchs in Berlin

Later life

However, later archival work by Soviet physicist German Goncharov suggested that while Fuchs's early work, most of which is still classified in the United States, did not aid the Soviets in their effort towards the hydrogen bomb, it was closer to the final correct solution than was recognized at the time, and indeed spurred Soviet research into useful problems which eventually resulted in the correct answer. Since most of Fuchs's work on the bomb, including a 1946 patent on a particular model for the weapon, are still classified in the United States, it has been difficult for scholars to fully assess these conclusions. In any case, it seems clear that Fuchs could not have just given the Soviets the "secret" to the hydrogen bomb, since he did not himself actually know it.[50]

Whether the information Fuchs passed relating to the hydrogen bomb would have been useful is still somewhat in debate. Most scholars have agreed with the assessment made by Hans Bethe in 1952, which concluded that by the time Fuchs left the thermonuclear program—the summer of 1946—too little was known about the mechanism of the hydrogen bomb for his information to be of any necessary use to the Soviet Union, because the successful Teller-Ulam design was not devised until 1951. Soviet physicists later noted that they could see as well as the Americans eventually did that the early designs by Fuchs and Edward Teller were useless.[49]

Hans Bethe once said that Klaus Fuchs was the only physicist he knew who truly changed history.[36] Because the head of the Soviet project, Lavrenti Beria, used foreign intelligence as a third-party check, rather than giving it directly to the scientists, as he did not trust the information by default, it is unknown whether Fuchs's fission information had a substantial effect. Considering that the pace of the Soviet program was set primarily by the amount of uranium they could procure, it is hard for scholars to accurately judge how much time this saved.[48]

Value of Fuchs's data to the Soviet project

Under interrogation by MI5 officer William Skardon at an informal meeting in December 1949, Fuchs initially denied being a spy and was not detained.[42] In January 1950, Fuchs arranged another interview with Skardon and voluntarily confessed that he was a spy.[43] Three days later, he also directed a statement more technical in content to Michael Perrin, the deputy controller of atomic energy within the Ministry of Supply.[44] Fuchs told interrogators the NKGB acquired an agent in Berkeley, California, who informed the Soviet Union about electromagnetic separation research of uranium-235 in 1942 or earlier.[45] Fuchs's statements to British and American intelligence agencies were used to implicate Harry Gold,[46] a key witness in the trials of David Greenglass and Julius and Ethel Rosenberg in the United States.[47]

By September 1949, information from the Venona Project indicated to GCHQ that Fuchs was a spy,[39] but the British intelligence services were wary of indicating the source of their information. The Soviets had broken off contact with him in February.[40] Fuchs may have been subsequently tipped off by Kim Philby. In October 1949, Fuchs approached Henry Arnold, the head of security at Harwell, with the news that his father had been given a chair at the University of Leipzig in East Germany.[41]

Fuchs later testified that he passed detailed information on the project to the Soviet Union through courier Harry Gold in 1945, and further information about Edward Teller's unworkable "Super" design for a hydrogen bomb in 1946 and 1947.[37] Fuchs attended a conference of the Combined Policy Committee (CPC) in 1947, a committee created to facilitate exchange of atomic secrets at the highest levels of governments of the United States, Great Britain and Canada; Donald Maclean, another Soviet spy, was also in attendance as British co-secretary of CPC.[38]

He was highly regarded as a scientist by the British, who wanted him to return to the United Kingdom to work on Britain's post-war nuclear weapons program;[34] he returned in August 1946 and became the head of the Theoretical Physics Division at the Atomic Energy Research Establishment at Harwell.[35] From late 1947 to May 1949 he gave Alexander Feklisov, his Soviet case officer, the principal theoretical outline for creating a hydrogen bomb and the initial drafts for its development as the work progressed in England and America. Meeting with Feklisov six times, he provided the results of the test at Eniwetok Atoll of uranium and plutonium bombs and the key data on production of uranium-235.[36]

At the request of Norris Bradbury, who had replaced Robert Oppenheimer as director of the Los Alamos Laboratory in October 1945, Fuchs stayed on at the laboratory into 1946 to help with preparations for the Operation Crossroads weapons tests. The US Atomic Energy Act of 1946 (McMahon Act) prohibited the transfer of information on nuclear research to any foreign country, including Britain, without explicit official authority, and Fuchs supplied highly classified US information to nuclear scientists in Britain as well as to his Soviet contacts. As of 2014 British official files on Fuchs were still being withheld.[32][33]

Post war

He (Fuchs) obviously worked with our people before and he is fully aware of what he is doing... He is a mathematical physicist... most likely a very brilliant man to have such a position at his age (he looks about 30). We took a long walk after dinner... He is a member of a British mission to the U.S. working under the direct control of the U.S. Army... The work involves mainly separating the isotopes... and is being done thusly: The electronic method has been developed at Berkeley, California, and is being carried out at a place known only as Camp Y... Simultaneously, the diffusion method is being tried here in the East... Should the diffusion method prove successful, it will be used as a preliminary step in the separation, with the final work being done by the electronic method. They hope to have the electronic method ready early in 1945 and the diffusion method in July 1945, but (Fuchs) says the latter estimate is optimistic. (Fuchs) says there is much being withheld from the British. Even Niels Bohr, who is now in the country incognito as Nicholas Baker, has not been told everything.[31]

Gold reported after his first meeting with Klaus Fuchs:

Klaus Fuchs's main courier was Harry Gold. Allen Weinstein, the author of The Haunted Wood: Soviet Espionage in America (1999), has pointed out: "The NKVD had chosen Gold, an experienced group handler, as Fuchs' contact on the grounds that it was safer than having him meet directly with a Russian operative, but Semyon Semyonov was ultimately responsible for the Fuchs relationship."[30]

Fuchs, who was known as "Karl" rather than "Klaus" at Los Alamos, dated grade school teachers Evelyn Kline and Jean Parker. He befriended Richard Feynman. Fuchs and Peierls were the only members of the British Mission to Los Alamos who owned cars, and Fuchs lent his Buick to Feynman so Feynman could visit his dying wife in hospital in Albuquerque.[29]

From August 1944 Fuchs worked in the Theoretical Physics Division at the Los Alamos Laboratory, under Hans Bethe. His chief area of expertise was the problem of imploding the fissionable core of the plutonium bomb. At one point, Fuchs did calculation work that Edward Teller had refused to do because of lack of interest.[25] He was the author of techniques (such as the still-used Fuchs-Nordheim method) for calculating the energy of a fissile assembly which goes highly prompt critical.[26] Later, he also filed a patent with John von Neumann, describing a method to initiate fusion in a thermonuclear weapon with an implosion trigger.[27] Fuchs was one of the many Los Alamos scientists present at the Trinity test.[28]

[24] (codename: "Raymond"), an NKGB agent in early 1944.Harry Gold He was contacted by [23] transferred along with Peierls to [21] In late 1943, Fuchs (codename: "Rest"; he became "Charles" in May 1944)

[20] Soon after, Fuchs contacted Jurgen Kuczynski, who was now teaching at the

Fuchs returned to Edinburgh in January, and resumed working for Born.[15] During 1940, he published four more papers with Born on The Mass Centre in Relativity, Reciprocity, Part II: Scalar Wave Functions, Reciprocity, Part III: Reciprocal Wave Functions and Reciprocity, Part IV: Spinor Wave Functions, and one by himself, On the Statistical Method in Nuclear Theory.[16] On May 1941, he was approached by Rudolf Peierls of the University of Birmingham to work on the "Tube Alloys" program – the British atomic bomb research project. Despite wartime restrictions, he was granted British citizenship on 7 August 1942 and signed an Official Secrets Act declaration form.[15][17] As accommodation was scarce in wartime Birmingham, he stayed with Rudolf and Genia Peierls.[18] Fuchs and Peierls did some important work together, which included a fundamental paper about isotope separation.[19]

[13], to bring Fuchs some magazines. Max Born lobbied for his release. On Christmas Day 1940, Fuchs and Kahle were among the first group of internees to board a ship to return to Britain.Wendell Furry, the brother-in-law of a friend of hers, Israel Halperin Kristel arranged for [14] Fuchs applied to become a

Second World War

After Emil was arrested in 1933, Kristel fled to Zurich, where she studied education and psychology at the University of Zurich. She returned to Berlin in 1934, where she too worked at the car rental agency. In 1936, Emil arranged with Quaker friends in the United States for Kristel to attend Swarthmore College there. She visited Fuchs in England en route to America, where she eventually married an American communist, Robert Heineman, and settled in Cambridge, Massachusetts. She became a permanent resident in the United States in May 1938.[10][11][12] In 1936, Kittowski and Elisabeth was arrested again, and the rental cars were impounded. Gerhard and Karin fled to Czechoslovakia. Elisabeth was released and went to live with Emil, while Kittowski, sentenced to six years, later escaped from prison and also made his way to Czechoslovakia. In March 1939, Elisabeth committed suicide by throwing herself from a train, leaving Emil to raise young Klaus.[12][11]

In Germany, Emil had been dismissed from his academic post, and, disillusioned with the Lutheran Church's support of the NSDAP, had become a Quaker in 1933.[6] He was arrested for speaking out against the government, but was only held for one month. Elisabeth married a fellow communist, Gustav Kittowski, with whom she had a child they named Klaus.[9] Elisabeth and Kittowski were arrested in 1933, and sentenced to 18 months imprisonment, but were freed at Christmas. Gerhard and his wife Karin were arrested in 1934, and spent the next two years in prison. Gerhard, Karin, Elisabeth and Kittowski established a car rental agency in Berlin, which they used to smuggle Jews and opponents of the government out of Germany.[9]

Fuchs arrived in England on 24 September 1933. Jessie Gunn was a member of the Wills family, the heirs to Imperial Tobacco and benefactors of the University of Bristol. She arranged for Fuchs to meet Nevill Mott, Bristol's professor of physics, and he agreed to take Fuchs on as a research assistant.[7] Fuchs earned his Ph.D. in physics there in 1937. A paper on "A Quantum Mechanical Calculation for the Elastic Constance of Monovalent Metals" was published in the Proceedings of the Royal Society in 1936. By this time Mott had a number of German refugees working for him, and lacked positions for them all. He did not think that Fuchs would make much of a teacher, so he arranged a research post for Fuchs, at the University of Edinburgh working under Max Born, who was himself a German refugee. Fuchs published papers with Born on "The Statistical Mechanics of Condensing Systems" and "On Fluctuations in Electromagnetic radiation" in the Proceedings of the Royal Society. He also received a Doctorate in Science degree from Edinburgh. Fuchs proudly mailed copies back to his father in Germany.[8]

Refugee in Britain

The KPD meeting in Berlin was held in secret. Fellow party members urged him to continue his studies in another country. He went into hiding for five months in the apartment of a fellow party member. In August 1933, he attended an anti-fascist conference in Paris chaired by Henri Barbusse, where he met an English couple, Ronald and Jessie Gunn, who invited Fuchs to stay with them in Clapton, Somerset. He was eventually expelled from the Kaiser Wilhelm Institute in October 1933.[4][6]

When Hitler became Chancellor of Germany in January 1933, Fuchs decided to leave Kiel, where the NSDAP was particularly strong, and he was a well-known KPD member, and he enrolled at the Kaiser Wilhelm Institute for Physics in Berlin. On 28 February, he took an early train to Berlin for a KPD meeting there. On the train, he read about the Reichstag fire in a newspaper. Fuchs correctly assumed that opposition parties would be blamed for the fire, and quietly removed his hammer and sickle lapel pin.[4][6]

In the March 1932 German presidential election, the SPD supported Paul von Hindenburg for president, fearing that a split vote would hand the job to the National Socialist German Workers' Party (NSDAP) candidate, Adolf Hitler. However, when the Communist Party of Germany (KPD) ran its own candidate, Ernst Thälmann, Fuchs offered to speak for him, and was expelled from the SPD. That year Fuchs and all three of his siblings joined the KPD.[1] Fuchs and his brother Gerhard were active speakers at public meetings, and occasionally attempted to disrupt NSDAP gatherings.[4] At one such gathering, Fuchs was beaten up and thrown into the river.[6]

[5][1]. The family later discovered that his maternal grandmother had also taken her own life.hydrochloric acid In October 1931, his mother committed suicide by drinking [4], which his brother Gerhard and sister Elisabeth also attended, and continued his studies in mathematics and physics.University of Kiel, and in the autumn Fuchs transferred to the Kiel His father took up a new position as professor of religion at the Pedagogical Academy in [3]

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