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- Cold War7
- History3
- Cold War (1945-1989)2
- Diplomatic relations2
- Foreign relations2
- History, Military2
- Warsaw Treaty Organization2
- World politics2
- Atrocities1
- Border patrols1
- Boundaries1
- Communism and liberty1
- Emigration and immigration1
- Escapes1
- Historiography1
- Political refugees1
- Politics and government1
- Victims of state-sponsored terrorism1