Columbia subject headings:
Harvard subject headings:
Internal security--Poland--Suwałki (Voivodeship)--History--20th century.
Poland. Urząd Bezpieczeństwa--History.
Princeton subject headings:
Internal security--Poland--Suwałki--History.
Poland--Politics and government--1945-1980.
Poland. Urząd Bezpieczeństwa--History.
Political persecution--Poland--Suwałki--History--20th century.
Suwałki (Poland)--History--20th century.