Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--History
Dictatorship--History--20th century.
Fascism--History--20th century
Totalitarianism--History--20th century.
World politics--20th century
Princeton subject headings:
Communism--Soviet Union--History--20th century.
Fascism--Europe--History--20th century.
National socialism.
Totalitarianism--History--20th century.