Cold War espionage describes the intelligence gathering activities during the Cold War between the Western allies and the Eastern Bloc. Both relied on a wide variety of military and civilian agencies in this pursuit.
Klaus Fuchs, exposed in 1950, is considered to have been the most valuable of the atomic spies during the Manhattan Project.
The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, that started in 1947, two years after the end of World War II and lasted to 1991, the fall of the Soviet Union.
Allied troops in Vladivostok, August 1918, during the Allied intervention in the Russian Civil War
American Relief Administration operations in Russia, 1922
Lenin, Trotsky and Kamenev celebrating the second anniversary of the October Revolution
The Battle of Stalingrad, considered by many historians as a decisive turning point of World War II