 The history of all hitherto existing society is the history of class struggles. Free man and slave, patrician and plebeian, lord and serf, kill master and journeyman, inner world, oppressor and oppressed, stood in constant opposition to one another, carried on an uninterrupted, now hidden, now open fight, a fight that each time ended, either in a revolutionary reconstitution of society at large or in the common ruin of the contending classes. The communists disdain to conceal their views and aims. They openly declare that their ends can be attained only by the forcible overthrow of all existing social conditions. Let the ruling classes tremble at a communistic revolution. The proletarians have nothing to lose but their chains. They have a world to win.