Columbia subject headings:
Communism--Europe, Eastern.
Europe, Eastern--Politics and government.
Harvard subject headings:
Communism--Europe, Eastern
Communism--Soviet Union
Europe, Eastern--Politics and government--1945-1989.
Soviet Union--Politics and government--1945-1991.
Princeton subject headings:
Communism--Europe, Eastern.
Communism--Soviet Union.
Europe, Eastern--Politics and government--1945-
Soviet Union--Politics and government--1945-1991.