I think my emotional revulsion against Stalin's terror would have stopped me in my tracks.

Hall was questioned by the Federal Bureau of Investigation in March 1951 but wasn't charged. Igor Kurchatov a brilliant scientist and the head of the Soviet atomic bomb effort probably used information provided by Klaus Fuchs to confirm corresponding information provided earlier by Hall. as Nazi Germany developed.

His brother Edward Hall was a rocket scientist who worked on ICBMs for the United States government.