The Libération-sud (French for "Liberation-South") resistance group was established by a group of French people, including Emmanuel d'Astier, Lucie Aubrac and Raymond Aubrac. The first important Resistant group to emerge after the German occupation, it began publishing Libération in July 1941. With the support of Daniel Mayer and the clandestine French Section of the Workers' International (SFIO, socialist party), the Liberation-sud group grew rapidly.
In 1942 Emmanuel d'Astier entered talks with Jean Moulin about the possibility of uniting all the resistance groups working in France. After much discussion Moulin persuaded the eight major resistance groups to form the Conseil National de la Résistance (CNR, National Council of Resistance). This included D'Astier's Libération-Sud as well as Combat (Henri Frenay), Franc-Tireur (Jean-Pierre Lévy), National Front (Pierre Villon), Comité d'Action Socialiste (Pierre Brossolette) and the Armée secrète (Charles Delestraint).