If it hadn't been for a shortfall in the supply of random numbers, one of history's most infamous spy rings might never have been exposed. The shortage occurred in late 1941, two years after the start of World War II. With Hitler's invading armies poised to overrun Moscow, Soviet leader (and erstwhile bank robber) Joseph Stalin ordered key personnel to evacuate the capital. In the chaos that followed, the NKVD Stalin's intelligence agency and forerunner of the KGB made a mistake that would doom all the Soviet agents who would infiltrate the Manhattan Project, the top-secret American effort to build an atomic bomb.
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