David Greenglass

David Greenglass was an American engineer and spy who, during the Cold War, provided classified information about U.S. nuclear weapons to the Soviet Union. He worked at the Los Alamos Laboratory and was recruited by Soviet agents, including his sister's husband, Julius Rosenberg. His testimony played a significant role in the infamous Rosenberg spy case. Greenglass’s espionage contributed to heightened fears of Soviet infiltration in the U.S. and led to multiple arrests and convictions. His actions and subsequent revelations remain a notable part of Cold War espionage history.