After the
German occupation of France in June 1940, Vallat supported the rise to power of Marshal
Philippe Pétain at the head of a
collaborationist regime based in
Vichy. On 10 July 1940, he voted in favour of granting the Cabinet presided by Marshal Pétain the authority to draw up a new constitution, thereby effectively ending the
French Third Republic and establishing Vichy France. In March 1941, he was appointed as head of the
Commissariat-General for Jewish Questions, a body set up to implement the anti-Semitic laws enacted by Pétain's government. He later established the
Union générale des israélites de France on 29 November 1941. In this position, he oversaw the "
Aryanisation" of the French economy, education system, civil service and professions, and the enforcement of laws requiring all Jews to be registered with the police. As the historian
Robert Paxton has demonstrated, these laws were passed by the Vichy regime on its initiative and not under German pressure, as both Pétain and Vallat claimed at their trials after the war. The German Ambassador to Vichy,
Otto Abetz, demanded that Pétain dismiss Vallat because of his corruption which happened in May 1942. This meant that it was Vallat's successor,
Louis Darquier de Pellepoix, who oversaw most of French co-operation with the German deportation of more than 70,000 French Jews to the
extermination camp at
Auschwitz, where most of them were killed. Vallat remained a supporter of Vichy's policies, however, and in June 1944, when the Allied armies had already
landed in Normandy, he was appointed head of the Vichy Radio following the assassination of
Philippe Henriot by the
Resistance. He broadcast regular anti-Semitic tirades until the Allies liberated Vichy in August. == After the war ==