Ted Hall

At 19 years old, the youngest scientist on the Manhattan Project and a key source of nuclear information for the Soviet Union . While at Los Alamos , Hall providing the Soviets with classified information about how to detonate nuclear weapons by implosion. These secrets are believed to have helped the Soviets save two to eight years in developing their own atomic bomb.

Hall was questioned by the FBI in 1951 but wasn't charged, for lack of evidence. Incredibly, despite having been infinitely more damaging to U.S. security than celebrated Soviet collaborators Harry Gold and Julius and Ethel Rosenberg, Hall was never imprisoned. He claims he simply believed no nation should hold a nuclear monopoly. Eventually, Hall moved to Britain .