Karl Marx was the father of communism. Marx's philosophy hinges on his view of human nature. Along with the Hegelian dialectic, Marx inherited a disdain for the notion of an underlying invariant human nature. Sometimes Marxists express their views by contrasting "nature" with "history". Sometimes they use the phrase "existence precedes consciousness". The point, in either case, is that who a person is, is determined by where and when he is -- social...