List of Soviet and Eastern Bloc defectors

Soon after the formation of the Soviet Union, emigration restrictions were put in place to keep citizens from leaving the various republics of the USSR, though some defections still occurred. During and after World War II, similar restrictions were put in place in non-Soviet countries of the Eastern Bloc, which consisted of the communist states of Central and Eastern Europe (except for non-aligned Yugoslavia).

Source: Wikipedia — List of Soviet and Eastern Bloc defectors (CC BY-SA 4.0)