Marx had hundreds of ideas that collectively are refered to as scientific socialism, or Marxism. Some of his main ideas were his theory of society as a superstructure built upon an economic base, his own version of the labour theory of value, his philosophical method called 'dialectical materialism' and the materialist conception of history, or historical materialism as most would say today.
Chat with our AI personalities
His followers were called Marxist's, so his belief system would be called Marxism.