Columbia subject headings:
Madrid (Spain)--History--Siege, 1936-1939.
Political persecution--Spain--Madrid--History--20th century.
Spain--History--Civil War, 1936-1939--Campaigns.
Harvard subject headings:
Madrid (Spain)--History--20th century.
Madrid (Spain)--History--Siege, 1936-1939
Spain--History--Civil War, 1936-1939
Princeton subject headings:
Madrid (Spain)--History--20th century.
Madrid (Spain)--History--Siege, 1936-1939.
Political persecution--Spain--Madrid--History--20th century.
Social control--Spain--Madrid--History--20th century.