Before Fuchs left for the United States at the end of 1943, the information that he transmitted to Moscow had “confirmed,” in the words of the KGB officer who was Fuchs’s control in London after the war, “that, first, the corresponding research in Hitler’s Germany had reached a dead-end; second, that the USA and Britain were already building industrial facilities to make atomic bombs.”105 This suggests that in 1943 Stalin should have known enough about the progress of research in other countries not to regard the Soviet atomic project as crucial to the outcome of the war with Germany. The
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