Columbia subject headings:
Harvard subject headings:
Communism
Communism--Soviet Union--History
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--History.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--Politics and government--1917-1936.
State-sponsored terrorism--Soviet Union--History.
Princeton subject headings:
Communism--Soviet Union--History.
Soviet Union--History--Revolution, 1917-1921.
State-sponsored terrorism--Soviet Union--History.