Columbia subject headings:
Harvard subject headings:
Anarchism--Italy--History--20th century
Exiles--Italy--History--20th century.
Syndicalism--Italy--History--20th century.
Unione sindacale italiana--History.
Princeton subject headings:
Italy--Politics and government--20th century.
Labor unions--Italy--History--20th century.
Syndicalism--Italy--History--20th century.
Unione sindacale italiana--History.