Nuclear espionage
David Greenglass – an American machine worker at Los Alamos National Laboratory during the Manhattan Project. Greenglass confessed that he gave rough diagrams of lab experiments to the Soviet Union during World War II. Some parts of his testimony against his sister and brother-in-law (the Rosenbergs, see below) are now thought to have been made up to try to keep his own wife out of trouble. Greenglass admitted spying and was given a long prison term.