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Klaus Fuchs (1911-1988) was one of several communist spies who independently leaked atomic secrets from the Manhattan Project at Los Alamos to the Soviet Union.  Fuchs was a brilliant German physicist who had belonged to the Communist Party of Germany in the 1930s.  Fuchs had scientific achievements in his own right, including a patent with John von Neumann and the discovery of the Fuchs-Nordheim model for calculating energies in nuclear reactions.<ref>http://209.85.165.104/search?q=cache:mOpQgi0wEyQJ:classes.engr.oregonstate.edu/ne/spring2001/ne453/Pulse-lab.doc+%22Fuchs-Nordheim%22&hl=en&ct=clnk&cd=5&gl=us&client=firefox-a</ref>

Klaus Fuchs (1911-1988) was one of several communist spies who independently leaked atomic secrets from the Manhattan Project at Los Alamos to the Soviet Union.  Fuchs was a brilliant German physicist who had belonged to the Communist Party of Germany in the 1930s.  Fuchs had scientific achievements in his own right, including a patent with John von Neumann and the discovery of the Fuchs-Nordheim model for calculating energies in nuclear reactions.<ref>http://209.85.165.104/search?q=cache:mOpQgi0wEyQJ:classes.engr.oregonstate.edu/ne/spring2001/ne453/Pulse-lab.doc+%22Fuchs-Nordheim%22&hl=en&ct=clnk&cd=5&gl=us&client=firefox-a</ref>

In addition to pass secrets to the communist Soviet Union about the design of the [[atomic bomb]] and, after the war, initial attempts to design a [[hydrogen bomb]], Fuchs also gave production information that allowed the Soviet Union to estimate how many atomic bombs the United States had.  As a result the Soviet Union realized that the United States was not as formidable as one might expect, because it did not hold enough atomic bombs to thwart massive communist aggression in the late 1940s and early 1950s.

In addition to passing secrets to the communist Soviet Union about the design of the [[atomic bomb]] and, after the war, initial attempts to design a [[hydrogen bomb]], Fuchs also gave production information that allowed the Soviet Union to estimate how many atomic bombs the United States had.  As a result the Soviet Union realized that the United States was not as formidable as one might expect, because it did not hold enough atomic bombs to thwart massive communist aggression in the late 1940s and early 1950s.

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