Sartre's thought and practice cannot be separated from the experience of the Second World War. Emerging from the war, Sartre formed the idea that the human comes forth out of the subhuman. This paper analyses aspects of Sartre's humanism from the point of view of his political commitment, and presents Sartre's work as an antidote to contemporary economic and scientific determinism. Sartre credit was always given to the growth of freedom in action out of the most unexpected subjectivization. He firmly supported the founding idea of democracy – the power of everyman – and projected the intellectual's mission into each of us once we try to rethink critically our actions in the light of human purposes.