1945    The USSR's nuclear program receives plans for the United States plutonium bomb from Klaus Fuchs at the Los Alamos National Laboratory.

1950    Cold War: Klaus Fuchs is convicted of spying for the Soviet Union by disclosing top secret atomic bomb data.

1950    Cold War: The Soviet Union issues a statement denying that Klaus Fuchs served as a Soviet spy.

1950    Cold War: In Philadelphia, Harry Gold pleads guilty to spying for the Soviet Union by passing secrets from atomic scientist Klaus Fuchs.

1950    Harry Gold is sentenced to thirty years in jail for helping Klaus Fuchs pass information about the Manhattan Project to the Soviet Union. His testimony is later instrumental in the prosecution of Julius and Ethel Rosenberg.

1959    Convicted Manhattan Project spy Klaus Fuchs is released after only nine years in prison and allowed to emigrate to Dresden, East Germany where he resumes a scientific career.