The Communist Manifesto: I. Bourgeois and Proletarians ...
https://www.sparknotes.com/philosophy/communist/full-text/bourgeois-and-proletarians/
The history of all hitherto existing societies is the history of class struggles. Freeman and slave, patrician and plebeian, lord and serf, guild-master and journeyman, in a word, 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 re-constitution of society at ...
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