Columbia subject headings:
Political persecution--Spain--Madrid--History--20th century.
Spain--History--Civil War, 1936-1939--Atrocities.
Spain--History--Civil War, 1936-1939--Prisoners and prisons.
Harvard subject headings:
Princeton subject headings:
Political persecution--Spain--History--20th century.
Secret service--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Atrocities.
Spain--Politics and government--1931-1939.
State-sponsored terrorism--Spain--History--20th century.