It’s been long known that Klaus Fuchs, Theodore Hall, and David Greenglass committed espionage at Project Y—the Los Alamos branch of the Manhattan Project—during World War II. Each worked at the secret laboratory charged with creating the world’s first atomic bombs, each stole classified weapons information, and each shared it with the Soviet Union. Just recently though, in September 2019, historians confirmed a fourth wartime spy: Oscar Seborer.
Read the full National Security Science article here.