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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 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]].   

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]].   

Because of the manner in which the head of the Soviet project, [[Lavrenty 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' fission information had a substantial impact (and 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 the Soviets). Some former Soviet scientists said they were actually hampered by Fuchs' data, because Beria insisted that their first bomb ("[[Joe 1]]") should resemble the American plutonium bomb ("[[Fat Man]]") as much as possible, even though the scientists had discovered a number of improvements and different designs.  

Because of the manner in which the head of the Soviet project, [[Lavrenty 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' fission information had a substantial impact (and 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 the Soviets). Some former Soviet scientists said they were actually hampered by Fuchs' data, because Beria insisted that their first bomb ("[[Joe 1]]") should resemble the American plutonium bomb ("[[Fat Man]]") as much as possible, even though the scientists had discovered a number of improvements and different designs.  

== References ==

== References ==

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[[Category:Physicists]]

[[Category:Physicists]]

[[Category:KGB Agents and Sources]]

[[Category:KGB Agents and Sources]]