It has been assumed that Klaus Fuchs could not have provided significant information to the Soviet Union regarding the hydrogen bomb because the calculations he took with him from Los Alamos were flawed. Recent evidence from British, American and former Soviet sources suggest that Fuchs played an invaluable role in the early development of thermonuclear weapons in all three countries. This article considers this new evidence and places Fuchs' role in the development of the H-bomb in the context of intelligence estimates that arose following his arrest.
↵School of History and School of Politics, University of Nottingham, Lenton Grove, Nottingham, NG7 2RD, England. ( ). I am grateful to the AHRB for research support and to the School of History and the School of Politics, University of Nottingham, for a small grant to purchase the FBI ““Foocase”” material. I also thank Kate Pyne, Arnold Kramish, Gregg Herken, Richard Aldrich, Chapman Pincher, and Sabine Lee.
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