Adam Schaff's Socialist Humanism Theory Changes

As a new Marxism of East-Europe, Adam Schaff has experienced a huge change in his thought. The aim of this paper is trying to figure out why this change could be possible and ineluctable in the big social and academic background. And this paper also tries to present socialist humanism and alienation of Schaff, and how Schaff uses them as a weapon to criticize Jean-paul Sartre and Althusser.