De atoomspion David Greenglass, broer van Ethel Greenglass, de vrouw van spion Julius Rosenberg.
“[He]was a skilled machinist in an army ordnance unit [and] was unexpectedly transferred to work on a secret project. By August [1944] he was in Los Alamos and assigned to work in a facility that made models of the high-technology bomb parts being tested by various scientific teams; specifically he worked on models of the implosion detonators being developed for the plutonium bomb.
A September 1944 cable from New York KGB states: “Liberal [codenaam voor Julius Rosenberg] recommended the wife of his wife’s brother, Ruth Greenglass … She is 21 years old, a [US citizen and a Young Communist]… [Her husband]is a mechanical engineer and is now working at the Enormous [KGB-codenaam voor het Amerikaanse atoombomproject] plant in Santa Fe, New Mexico.” A KGB message dated [14-11-1944]reported that Ruth had agreed to assist in “drawing in” David, and that Julius would brief her before she left for New Mexico. On [16 dec. 1944] New York KGB reported that David had agreed to become a Soviet source [and in January 1945 they reported] that David had given an initial report on his implosion detonator work.”
In 1950 werd David Greenglass door de FBI gearresteerd. Hij bekende gespioneerd te hebben en verklaarde, dat ook zijn vrouw en zijn zwager, Julius Rosenberg, daarbij betrokken waren geweest. [J.E. Haynes & H. Klehr, Venona, decoding Soviet Espionage in America (Yale University, New Haven 1999), p. 308-310.]
Hij werd veroordeeld tot een gevangenisstraf en werd in 1960 vrijgelaten.