The object of this book is not to provide a history of Socialism, but merely an account of the Socialist organizations of modern times. It gives accounts of persons connected with, or giving rise to, concrete societies or groups. Contents: origins of modern Socialism; Marxian Socialism, prewar period; anarchism and syndicalism; the war and pacifism; Russian revolution; world Bolshevism; Bolshevism in Great Britain; capture of trade unionism; Bolshevisation of British trade unionism; subsidiary Communist organizations; pacifism, postwar; youth movements; Socialism and Christianity.