Columbia subject headings:
Communism--Poland--History--20th century.
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.
Political violence--Poland--History--20th century.
Harvard subject headings:
Communism--Poland--History--20th century
Poland--Politics and government--1945-1980
Poland--Politics and government--1980-1989
Political violence--Poland--History--20th century.
Princeton subject headings:
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.
Polska. Służba Bezpieczeństwa.
Polska. Urząd Bezpieczeństwa.