The German Ideology
The German Ideology is a set of unpublished manuscripts written by Karl Marx and Friedrich Engels around April 1846. It consists of two volumes. The first is subtitled "Critique of Modern German Philosophy According to Its Representatives," and attacks Ludwig Feuerbach, Max Stirner, and Bruno Bauer, all thinkers associated with the Young Hegelians. The second is subtitled "Critique of German Socialism According to Its Various Prophets," and deals with the "True Socialists" Hermann Semmig, Rudolph Matthäi, Karl Grün and Georg Kuhlmann.
The first sections of the first volume contain an early statement of Marx's materialist conception of history.