Dublin, Ireland (1997)
The history of all hitherto existing society 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 uninterupted, 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.

Karl Marx and Friedrich Engels
The Communist Manifesto