Columbia subject headings:
Communism--Spain--History.
Political persecution--Spain--History--20th century.
Spain--History--Republic, 1931-1939.
Spain--Politics and government--1931-1939.
Harvard subject headings:
Communism--Spain--History--20th century
Political persecution--Spain--History--20th century.
Spain--History--Republic, 1931-1939.
Spain--Politics and government--1931-1939.
Princeton subject headings:
Communism--Spain--History--20th century.
Political persecution--Spain--History--20th century.
Spain--History--Republic, 1931-1939.
Spain--Politics and government--1931-1939.