Rosenberg Spy Case

Ethel and Julius Rosenberg in 1953 in a New York police van shortly before their execution for spying

The couple was investigated in 1950, tried in 1951 for conspiracy to commit espionage and convicted and sentenced to death in 1953. In the 1940s, Greenglass was an Army sergeant working at the Manhattan Project, the atomic bomb project, in Los Alamos, New Mexico. He eventually confessed to being a spy recruited by Julius Rosenberg and agreed to testify against the couple at trial.[source:cnn.com]