He didn't even know there were other spies in the project. He didn't know that the FBI's counterintelligence operations had caught on to some of the other Soviet spies working on the Manhattan Project. That career took him into the field of electron microscopy, and he moved to England to take a job at Cambridge. It was in Chicago where he met his wife, started his family and began his civilian scientific career. He finished a master's degree and a doctoral degree at the University of Chicago. He worked for the USSR under the code name MLAD (meaning 'young') until 1945, when he returned to Harvard.Īfter the war, Hall was not suspected of being a Soviet asset. Hall was not the most devastating spy in the Manhattan Project, but he provided the process necessary for purifying plutonium and handed over the specifications for the 'Fat Man' plutonium bomb the Americans dropped on the Japanese city of Nagasaki. The main reason he did it, according to his own interview in the documentary: 'Compassion.'

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