Columbia subject headings:
Intelligence service--Poland--History--20th century.
Internal security--Poland--History--20th century.
Poland--Politics and government--1945-1989--Sources.
Harvard subject headings:
Intelligence service--Poland--History.
Internal security--Poland--History.
Poland--History--1945-1980
Poland--Politics and government--1945-1980
Princeton subject headings:
Intelligence service--Poland.
Intelligence service--Soviet Union.
Poland--Politics and government--1945-.
Political persecution--Poland.