In 1941 Bastid was dismissed from his office as Councilor General by the
Vichy government. Bastid became active in the
French Resistance. At the start of the summer of 1942 Bastid circulated a document to many parliamentarians in which he asserted that Marshal
Philippe Pétain had violated the mandate given him on 10 July 1940, and protested against the abuses of the Vichy government. He called for creation of a new government. Through the Bastids the Faculty of Law of Lyon became a center of resistance. In August 1942 Bastid wrote to General
Charles de Gaulle recognizing him as head of
France combattante (Fighting France). In 1943 he was a member of the
National Council of the Resistance (Conseil National de la Résistance, CNR). When the Council drew up its programme for political reform after the Liberation in 1944, Bastid threatened to resign if it committed to granting the vote to women. The Comité des Experts (Committee of Experts) was formed in June 1942 on the initiative of
Jean Moulin. The committee became known as the General Studies Committee (Comité général d'études, CGE) from February 1943. Its purpose, confirmed by the CNR when it first met in May 1943, was to work out how France was to be run after Liberation. The members were Bastid,
Robert Lacoste,
François de Menthon and
Alexandre Parodi.
Pierre-Henri Teitgen was rapporteur for political questions and
René Courtin was rapporteur for economic questions. In a report issued in April 1943 Bastid was skeptical about a collaborationist vision of Europe along the lines advocated by Vichy. Later the Committee was encouraged to explore the possibility of a European federation. Bastid was a member of a committee of nine Radical politicians who met weekly from October 1943. The others were Hippolyte Ducos, Armand Dupuis,
Laurent Eynac, André Isoré,
Victor Pierre Le Gorgeu,
Adolphe Landry, Marcel Plaisant and Pierre Mazé. In August 1944 Bastid occupied the Ministry of Foreign Affairs at the
Quai d'Orsay in the name of the CNR, and directed it for several days pending the arrival of the government from
Algiers. He was a member of the
Provisional Consultative Assembly from 1944 to 1945, where he was president of the committee for reform of the state. After the Liberation of France he was director of the journal ''
l'Aurore'' for several years. ==Later career (1945–74)==