Columbia subject headings:
Criminals--Spain--History--20th century--Sources.
Police--Spain--Records and correspondence--History--20th century.
Spain--Social life and customs--20th century.
Subculture--Spain--History--20th century.
Harvard subject headings:
Crime--Spain--History--20th century.
Criminals--Spain--History--20th century.
Gangsters--Spain--History--20th century.
Outcasts--Spain--History--20th century.
Outlaws--Spain--History--20th century.
Princeton subject headings:
Crime--Spain--History--20th century.
Criminals--Spain--History--20th century.
Gangsters--Spain--History--20th century.
Outcasts--Spain--History--20th century.
Outlaws--Spain--History--20th century.