Who was a member of an international organization that was formed in 1957?
The Movement of the Free Spirit: The Movement of the Free Spirit: General Considerations and Firsthand Testimony Concerning Some Brief Flowerings of Life in the Middle Ages, the Renaissance and, Incidentally, Our Own Time (French: "Le mouvement du Libre-Esprit" ) is a 1986 book by former Situationist International (SI) member Raoul Vaneigem published in English in 1998 by Zone Books. Situationist International: The Situationist International (SI) was an international organization of social revolutionaries made up of avant-garde artists, intellectuals, and political theorists, prominent in Europe from its formation in 1957 to its dissolution in 1972.
Raoul Vaneigem