Julius and Ethel Rosenberg were American Communists who were executed for passing nuclear secrets to the Soviet Union. They met in the Young Communist League in 1936, where he was a leader.
They had two sons. Julius was recruited by the KGB in 1942 and was regarded as one of their top spies. He passed classified reports from Emerson Radio, including a fuze design which was later used to shoot down a U-2 in 1960.
Julius also recruited many people sympathetic to the cause to assist the KGB. He provided the KGB with thousands of documents from the National Advisory Committee for Aeronautics including a complete set of design and production drawings for the Lockheed's P-80 Shooting Star.
In 1951 the case against the Rosenbergs began. Greenglass, the prosecution's main witness, told the court that his sister Ethel had typed nuclear secrets he gave her at a meeting in their home, and that he gave Julius a sketch of a cross-section of an implosion type nuclear bomb.
Both Rosenbergs were found guilty and sentenced to death. Their conviction gave fuel to Senator McCarthy's investigations into anti-American activities. They were both executed by electric-chair in Sing Sing Prison in 1953.