Columbia subject headings:
Communist parties--Spain.
Left-wing extremists--Spain--History--20th century.
Spain--Politics and government--1975-1982.
Harvard subject headings:
Communist parties--Spain.
Left-wing extremists--Spain--History--20th century.
Spain--Politics and government--1975-1982.
Princeton subject headings:
Communist parties--Spain.
Left-wing extremists--Spain--History--20th century.
Spain--Politics and government--1975-1982.