“They didn't want him arrested because if they had to charge him, it would expose the fact that he was working on this top-secret project,” Klehr says. Army intelligence officials drafted Hiskey into active duty (he had a reserve commission) and shipped him off to Alaska. After he was seen meeting with the known Soviet agent Arthur Adams in 1944, U.S. Hiskey passed information to the GRU, or Soviet military intelligence, rather than the KGB. Hiskey, a chemist, began working on gaseous diffusion at Columbia University and was later transferred to Chicago’s Metallurgical Laboratory (Met Lab), another key part of the Manhattan Project. Clarence HiskeyĬlarence Hiskey (at left), former physics professor and atomic scientist, appears in Brooklyn federal court on November 11, 1950. ![]() McNutt’s espionage was later revealed in the notebooks of Alexander Vassiliev, a journalist and former KGB officer who was able to take notes on sensitive KGB archives dating to 1930-50. After the war, McNutt worked for Gulf Oil and led the company’s Gulf-Reston division, which built the planned community in Reston, Virginia-right next to the CIA’s Langley headquarters. “The FBI questioned him because he was friendly with Rosenberg, but they never suspected him of being a spy,” Klehr says. Though he gave the Soviets the plant's design, McNutt (despite Soviet pleas) refused Kellex’s offer to relocate from New York to Oak Ridge, where he would have had access to more scientific data. Rosenberg connected McNutt to the KGB, the Soviet security agency. McNutt was a civil engineer in New York City and a friend of Julius Rosenberg, who in late 1943 encouraged him to get a job at Kellex, a company building the massive gaseous diffusion plant to separate uranium at Oak Ridge. Based largely on the Greenglasses’ testimony, the Rosenbergs were convicted and executed in June 1953. His cooperation earned him a lesser sentence and immunity for his own wife, Ruth. In his 1950 confession, Greenglass implicated his own sister, Ethel Rosenberg, whom he said had typed the notes that were sent to the Soviets. Recruited to spy for the Soviets by his brother-in-law, Julius Rosenberg, Greenglass passed information to the Soviets in mid-1945 that included a hand-drawn sketch and notes describing the implosion-type bomb. Army machinist who had worked at the classified nuclear facility at Oak Ridge, Tennessee before being assigned to Los Alamos in 1944. ![]() Gold in turn named David Greenglass, a U.S. Greenglass passed on data about the making of atomic bombs to his sister, Ethel Rosenberg. David Greenglass, a sergeant and machinist assigned to the Manhattan Project, shown in 1950.
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