Documents on the Eastern Bloc military and security organization dominated by the Soviet Union.Also known as the Warsaw Treaty Organization, or the Treaty of Friendship, Cooperation, and Mutual Assistance. The documents span 1955 to 1988, and most come from archives in Russia, Bulgaria, Romania, and Poland. Most discuss troop movements amongst the Warsaw Pact states. Topics discussed include military exercises, cooperatives agreements, Romania and Czech military formations, and relations with the United States. See also the 1956 Polish and Hungarian Crisis, the 1980-81 Polish Crisis, the Soviet Invasion of Czechoslovakia, and Warsaw Pact Military Planning. (Image, Warsaw Pact leaders, 1987, Bundesarchiv, Bild 183-1987-0529-029)