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    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  |