Columbia subject headings:
Informers--Poland--History--20th century.
Poland--Politics and government--1945-1980.
Poland. Służba Bezpieczeństwa--History.
Harvard subject headings:
Collaborationists--Poland.
Informers--Poland--History--20th century.
Poland--Politics and government--1945-1980
Poland. Służba Bezpieczeństwa--History.
Police patrol--Poland--Surveillance operations.
Secret service--Poland.
Princeton subject headings:
Collaborationists--Poland.
Poland--Politics and government--1945-1980.
Police patrol--Poland--Surveillance operations.
Secret service--Poland.