The Communist Manifesto; The Condition of the Working Class in England in 1844; Socialism: Utopian and Scientific

it has simplified the class antagonisms

Freeman and slave, patrician and plebeian, lord and serf, guild-master and journeyman, in a word, oppressor and oppressed

is the history of class struggles

The history of all hitherto existing societies

All the Powers of old Europe have entered into a holy alliance to exorcise this spectre

Society as a whole is more and more splitting up into two great hostile camps, into two great classes, directly facing each other: Bourgeoisie and Proletariat.

bourgeois society, living labour is but a means to increase accumulated labour. In Communist society, accumulated labour is but a means to widen, to enrich, to promote the existence of the labourer.