Columbia subject headings:
Harvard subject headings:
Russia--History--Revolution, 1905-1907.
Social classes--Russia--History--20th century.
Social classes--Soviet Union--History--20th century.
Strikes and lockouts--Russia--History--20th century.
Strikes and lockouts--Soviet Union--History--20th century.
Working class--Political activity--Russia--History--20th century.
Working class--Soviet Union--Political activity--History--20th century.
Princeton subject headings:
Proletariat.
Social conflict--Soviet Union.
Soviet Union--History.