Columbia subject headings:
Catholic labor unions--Italy--Turin--History--20th century.
Catholics--Political activity--Italy--Turin--20th century.
Working class--Italy--Turin--History--20th century.
Harvard subject headings:
Catholic labor unions--Italy--Turin--History--20th century.
Catholics--Italy--Turin--Political activity--20th century.
Working class--Italy--Turin--History--20th century.
Princeton subject headings:
Catholic labor unions--Italy--Turin--History--20th century.
Catholics--Italy--Turin--Political activity--20th century.
Working class--Italy--Turin--History--20th century.