Columbia subject headings:
Harvard subject headings:
Czechoslovakia. Státní bezpečnost.
Intelligence service--Czechoslovakia--History.
Internal security--Slovakia--History--20th century.
Political persecution--Czechoslovakia--History.
Political persecution--Slovakia--History--20th century.
Political persecution--Slovakia--History.
Princeton subject headings:
Czechoslovakia--Politics and government--1945-1992.
Czechoslovakia. Státní bezpečnost--History.
Political persecution--Czechoslovakia--History--Sources.
Secret service--Czechoslovakia--History--Sources.
Slovakia--Politics and government.