Ethel and Julius Rosenberg, Klaus Fuchs, Harry Gold, David Greenglass

Clockwise from the top left, Julius and Ethel Rosenbergas leaving court after being convicted of espionage on March 29, 1951. Klaus Fuchs after his release from an English prison on June 6, 1959; he immediately defected to East Germany. David Greenglass’s mugshot, undated. Harry Gold testifying at a Senate hearing investigating American spying for the Soviet Union, April 26, 1956.

Library of Congress; Keystone Press/Alamy Stock Photo; National Archives and Records Administration/Wikimedia Commons; AP Photo/Henry Griffin