Columbia subject headings:
Working class--Italy--Rome--History.
Harvard subject headings:
Italy--Politics and government--1870-1914.
Labor movement--Italy--Rome.
Rome (Italy)--Politics and government--1870-1945.
Socialism--Italy--Rome--19th century.
Socialism--Italy--Rome--History--19th century.
Working class--Political activity--Italy--Rome--History--19th century.
Princeton subject headings:
Labor movement--Italy--Rome--History.