Whereas capitalism is the breeding ground for fascism, socialism aims to create a society in which everyone is free.
One of the ideas which recurs most frequently in Sartre’s political writing is that no society is free unless all its members enjoy the same degree of freedom.
And since, as he argues, this is not the case in capitalist society, where members of the working class are far less free than those of the middle class – or, as he always called it, the bourgeoisie – the first task of the writer who wishes to increase human freedom is to try to produce a socialist society.