Marxist humanism is a branch of Marxism that primarily focuses on Marx's earlier writings, especially the Economic and Philosophical Manuscripts of 1844 in which Marx espoused his theory of alienation, as opposed to his later works, which are considered to be concerned more with his structural conception of capitalist society. The Praxis School, which called for radical social change in Josip Broz Tito's Yugoslavia in the 1960s, was one such Marxist humanist movement.