Columbia subject headings:
Communists--France--Congresses.
Socialists--France--Congresses.
Sorel, Georges, 1847-1922--Congresses.
Violence--Congresses.
Harvard subject headings:
Communists--France--Congresses.
Socialists--France--Congresses.
Sorel, Georges, 1847-1922--Congresses.
Violence--Congresses
Princeton subject headings:
Communism--Congresses.
Socialism--Congresses.
Sorel, Georges, 1847-1922--Congresses.