Communism is the riddle of history solved, and it knows itself to be this solution. Marx stated that "the history of all hitherto existing society is the history of class struggles ", something that he believed was happening between the bourgeoisie the select few upper class and upper middle class who then controlled society and the proletariat the working class masses who toiled to produce everything but who had no political control. He purported the idea that human society moved through a series of progressive stages from primitive communism through to slavery , feudalism and then capitalism — and that this in turn would be replaced by communism. Therefore, for Marx communism was seen as inevitable, as well as desirable. Marx founded the Communist Correspondence Committee in through which the various communists, socialists and other leftists across Europe could keep in contact with one another in the face of political repression. He then published The Communist Manifesto in , which would prove to be one of the most influential communist texts ever written.