In what year was the spy captured in the same five year period as Julius and Thel Rosenberg born?
Klaus Fuchs: Emil Julius Klaus Fuchs (29 December 1911 – 28 January 1988) was a German theoretical physicist and atomic spy who, in 1950, was convicted of supplying information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after the Second World War.
i don't know