Columbia subject headings:
Communism--Europe, Eastern.
Communism--Europe.
Communist parties--Europe, Eastern.
Communist parties--Europe.
Harvard subject headings:
Communism--Europe
Communism--Europe, Eastern
Communist parties--Europe, Eastern.
Communist parties--Europe.
Princeton subject headings:
Communism--Europe, Eastern.
Communism--Europe.
Communist parties--Europe, Eastern.
Communist parties--Europe.