Cold War espionage
After the end of WWII, French intelligence efforts turned to the Ukraine. This began the Cold War, which encompasses espionage, political, and military conflicts between the United States and the Soviet Union.
The Soviet Intelligence Agency KGB was successful in deeply penetrating sensitive areas of the US government. This was usually done with the cooperation of US citizens, who found philosophical objection to the possibility of an American monopoly on nuclear technology, as threat to peace and freedom.
See also
Categories: Military stubs | Espionage