Columbia subject headings:
Naples (Italy)--Economic conditions.
Socialism--Italy--History.
Working class--Italy--Naples--History.
Harvard subject headings:
Labor movement--Italy--Naples--History.
Naples (Italy)--Economic conditions--1860-1945.
Naples (Italy)--Economic conditions.
Socialism--Italy--Naples--History.
Socialism--Italy--Naples.
Working class--Italy--Naples--History.
Princeton subject headings:
Labor movement--Italy--Naples--History.
Naples (Italy)--Economic conditions--1860-1945.
Socialism--Italy--Naples--History.