Introduction to Eastern Europe
One of the most important contributions made by Trotsky to the theoretical storehouse of Marxism was his analysis of the rise and development of Stalinism. He explained that the fundamental social gains of the October revolution remained intact, in the form of the state-ownership of the economy and the plan of production, but that the working class had been politically expropriated by a new ruling caste. Against those who saw this bureaucracy as a new ruling class, Trotsky argued that it was a parasitic growth resting on the economic base of a workers' state, and not a class.