Dan talks to Frank Close about Klaus Fuchs, who leaked nuclear secrets to the Soviets. He informed the Soviets that the Allies had a bomb, and in doing so, may have been responsible for saving many millions of lives. Close argues that once Stalin realised the ballistic capacity of the U.S. and the U.K., he may have realised a policy of aggression against the Western powers was not prudent.

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Producer: Peter Curry

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