Witness: Witness Archive 2015

In February 1950, the first spy of the Cold War, German-born physicist Klaus Fuchs, was arrested after he confessed that he had been passing top secret information about Britain and America's nuclear programme to Moscow. During the war, Fuchs had worked in America on the first atomic bomb. His nephew Klaus Fuchs-Kittowski tells Witness about his uncle. (Photo: Physicist and spy Klaus Fuchs (left) is met by his nephew at an airport in East Berlin in 1959 after being released from a British prison where he spent nine and a half years for spying for the Soviet Union. Credit: Keystone/Hulton Archive/Getty Images)