Although it was at the center of the National Revolution and of the political reforms undertaken in its name, the “€œcommunist” utopia had never been systematically analyzed. By bringing to light the Days of the Mont-Dore which gathered, under Marshall Pétain’s patronage, in April and September 1943, many of the movements that were appealing to this communist revolution, this article aims at contributing to such an analysis in the broader perspective of a social history of the third way ideology and networks. It is important to understand the force and permanence of social and political representations underlying this third way to explain how this ideology, born from the conservative revolution of the thirties, could contribute to the reformist modernization of the fifties, a journey in which the Mont-Dore was a key moment.