Description
When the three leaders of Britain, the United States and the Soviet Union, met at Potsdam in July 1945, President Truman announced to Stalin that the US had a new weapon. In fact, Stalin was well aware of the existence of the atomic bomb. Stalin owed his knowledge to the atomic scientist Dr Klaus Fuchs. A refugee from Nazi Germany, entrusted with crucial work for the British and American nuclear weapons project, Fuchs gave every piece of information he had to the KGB. The world that Fuchs helped create remained in the grip of a nuclear stand-off for a generation.