Columbia subject headings:
Harvard subject headings:
Political parties--Poland--Białystok (Voivodeship).
Working class--Poland--Białystok (Voivodeship)
Working class--Poland--Political activity.
Princeton subject headings:
Białystok (Poland : Voivodeship)--Politics and government.
Communist parties--Poland--Białystok (Voivodeship)--History--20th century.
Working class--Political activity--Poland--Białystok (Voivodeship)--History--20th century.