Columbia subject headings:
Harvard subject headings:
Communists--Italy--Registers.
Radicals--Italy--Registers.
Socialists--Italy--Registers.
Princeton subject headings:
Biella (Italy : Province)--Registers.
Communists--Italy--Registers.
Italy. Direzione generale della pubblica sicurezza
Radicals--Italy--Registers.
Sesia River Valley (Italy)--Registers.
Socialists--Italy--Registers.
Vercelli (Italy : Province)--Registers.