“Let the ruling classes tremble at a Communistic revolution. The proletarians have nothing to lose but their chains. They have a world to win.Workingmen of all countries unite!”

“The proletarians have nothing to loose but their chains. They have a world to win.”

“You have nothing to lose but the chains of reality.”

“Both for the production on a mass scale of this communist consciousness, and for the success of the cause itself, the alteration of men on a mass scale is necessary, an alteration which can only take place in a practical movement, a revolution; this revolution is necessary, therefore, not only because the ruling class cannot be overthrown in any other way, but also because the class overthrowing it can only in a revolution succeed in ridding itself of all the muck of ages and become fitted to found society anew.”

“Except for the small revolutionary groups which exist in all countries, the whole world was determined upon preventing revolution in Spain. In particular the Communist Party, with Soviet Russia behind it, had thrown its whole weight against the revolution. It was the Communist thesis that revolution at this stage would be fatal and that what was to be aimed at in Spain was not workers' control, but bourgeois democracy. It hardly needs pointing out why 'liberal' capitalist opinion took the same line.”

“There is no proletarian, not even a Communist movement, that has not operated in the interests of money, and for the time being permitted by money - and that without the idealists among its leaders having the slightest suspicion of the fact.”