Communism
Hess originally advocated Jewish integration into the universalist socialist movement, and was a friend and collaborator of Karl Marx and Friedrich Engels. Hess converted Engels to Communism, and introduced Marx to social and economic problems. He played an important role in transforming Hegelian dialectical idealism theory of history to the dialectical materialism of Marxism, by conceiving of man as the initiator of history through his active consciousness.
Hess was probably responsible for several "Marxian" slogans and ideas, including religion as the "opiate of the people." Hess became reluctant to base all history on economic causes and class struggle, and he came to see the struggle of races, or nationalities, as the prime factor of history.