Columbia subject headings:
Labor policy--Italy--History--20th century.
Labor unions and communism--Italy--History--20th century.
Labor unions--Political activity--Italy--History--20th century.
Partito comunista italiano--History.
Harvard subject headings:
Labor policy--Italy--History--20th century.
Labor unions and communism--Italy--History--20th century.
Labor unions--Political activity--Italy--History--20th century.
Partito comunista italiano--History.
Princeton subject headings:
Labor policy--Italy--History--20th century.
Labor unions and communism--Italy--History--20th century.
Labor unions--Italy--Political activity--History--20th century.
Partito comunista italiano--History.