The present article tells the story of Objectif 72, a club-movement of leftist Christians created in 1966 and mostly formed by people coming from the left wing of the French Christian democratic party (MRP). Its representatives, including the leader Robert Buron, aimed at influencing the process of reorganization of the French Left by imposing their vision made of humanism, democracy from below and federalism, Third-Worldism, environmentalism. Featuring some major characteristics of the New Left, O72 sought to build up a common platform to oppose Gaullism. More broadly, O72 wanted to be a think tank on the technological modernization of the western civilization – a historical turn that the existing political elites seemed unable to handle in terms of language, relationship with civil society, and conception of power. That is why some of O72 militants strongly backed May 68 unrest, in which they recognized the implementation of a new model of society based on participation, self-management, and fight against hierarchies. Active on the international scene, O72 tried to establish a European network of radical Left. Once the club was dismantled, its members created Objectif socialiste (OS), which was dissolved in its turn in 1975.