Columbia subject headings:
Labor movement--Russia (Federation)--Saint Petersburg--Congresses--Sources.
Labor unions--Russia (Federation)--Saint Petersburg--Congresses--Sources.
Harvard subject headings:
Labor movement--Russia (Federation)--Saint Petersburg--Congresses--Sources.
Labor unions--Russia (Federation)--Saint Petersburg--Congresses--Sources.
Princeton subject headings:
Labor unions--Soviet Union--Political activity--History.
Saint Petersburg (Russia)--History--Revolution, 1917-1921.
Soviet Union--History--Revolution, 1917-1921.