That theory is found in his preface to A Contribution to a Critique of Political Economy.
In 2001, G.A. Cohen published a book-length defense of one of this man's interpretive theories, which was previously denounced as a "farrago" in The Illusion of the Epoch by H.B. Acton and attacked as immoral in Karl Popper's The Poverty of Historicism. That theory is found in his preface to A Contribution to a Critique of Political Economy. An analysis of contemporary politics is found in his The 18th Brumaire of Louis Napoleon, while his predictions for the future are found in the Critique of the Gotha Programme. He responded to Bruno Baeur's case for atheism by making a vague distinction between "political" freedom and "human" freedom in On The Jewish Question. He says that the need for "communal essence" pairs with alienation to create religion in Contribution to a Critique of Hegel's Philosophy of Right, which also comments that "religion is the opiate of the people." FTP, name this guy who had a theory of historical materialism and collaborated with Friedrich Engels on Capital.
In 2001, G.A. Cohen published a book-length defense of one of this man's interpretive theories, which was previously denounced as a "farrago" in The Illusion of the Epoch by H.B. Acton and attacked as immoral in Karl Popper's The Poverty of Historicism.
Karl Marx