Columbia subject headings:
Communism.
Communist countries--Politics and government.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-
Socialism.
Harvard subject headings:
Communism
Communist countries--Politics and government.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-
Socialism
Princeton subject headings:
Communism.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-
Socialism.