Republican Syndicalist Party
Collaborators to the "Cahiers Bleus" included Edouard Berth , who had co-founded the "Cercle Proudhon" with Valois , Marcel Déat , a future neo-socialist excluded from the French Section of the Workers' International ( SFIO ) and then collaborationist , Bertrand de Jouvenel , co-founder of the liberal Mont Pelerin Society , and Pierre Mendès France , future Prime minister during the Fourth Republic , from the young guard ( "jeunes loups" ) of the Radical-Socialist Party . 
<triplet> Bertrand de Jouvenel <subj> Mont Pelerin Society <obj> member of