It divided itself however on the attitude to adopt toward Nazi Germany: while most members opposed the appeasement policy which led to the November 1938 Munich Agreement, some upheld pacifism over all.
The Committee was founded in March 1934 under the initiative of Pierre Gérôme (pseudonym of François Walter, who worked doing audits at the Cour des Comptes).
Three important personalities took part in the Antifascist Committee's foundation: Paul Rivet, a socialist ethnologist, philosopher Alain, often considered as the thinker of the Radical-Socialist Party (although his anti-militarism and resistance toward all powers might lead him to be categorized as an anarchist or libertarian thinker), and physicist Paul Langevin, close to the communist party (PCF).
Gathering the three left-wing families (Radical-Socialist, SFIO and Communist Party), the Committee retrospectively appears as a precursor to the Popular Front (1936–38) led by Léon Blum.
A few of the most radical pacifists would go as far as collaborating with the German troops in the hope of a reestablishment of the Republic (replaced after the 1940 Battle of France by the reactionary "French State" led by Marshall Pétain).