Columbia subject headings:
Communism.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za.
Harvard subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za. Sʺezd (26th : 1981 : Moscow, Russia)
Permanent revolution theory.
Princeton subject headings: