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.

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