Columbia subject headings:
Communist parties.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za.
Harvard subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za.
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings:
Communist parties.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za.