Columbia subject headings:
Communism--Europe.
Communism--Soviet Union.
Labor unions and communism--Italy.
Partito comunista italiano.
Harvard subject headings:
Communism--Europe
Communism--Soviet Union
Labor unions and communism--Italy.
Partito comunista italiano
Princeton subject headings:
Communism--Europe.
Communism--Russia.
Labor unions and communism--Italy.
Partito comunista italiano.