Columbia subject headings:
Harvard subject headings:
Radicalism--Italy--Naples--History.
Republicanism--Italy--Naples--History.
Socialism--Italy--Naples--History.
Socialism--Italy--Naples.
Princeton subject headings:
Naples (Italy)--Politics and government--1860-1945.
Partito repubblicano italiano--History.
Partito socialista italiano--History.
Radicalism--Italy--Naples--History.
Republicanism--Italy--Naples--History.
Socialism--Italy--Naples--History.