He was a minister of state under Camille Chautemps's third Ministry from June 1937 to January 1938, during the period of the Popular Front.
Faure first became a member of Jules Guesde's Parti ouvrier français (POF) in 1901 and was editor-in-chief of the Populaire du Centre.
Starting from 1915, he rallied to the centrist and pacifist minority of Jean Longuet in the SFIO, and during the Tours Congress in 1920 he opposed adhesion to the Third International.
The Marxist philosopher Antonio Gramsci underscored how, when Faure visited Imola in 1919, after the Bologna Congress, he had seemed to be in perfect agreement with the representatives of Italian "unitarism".
He was elected to the National Assembly several times.
After Édouard Daladier negotiated the Munich agreement in 1938 Paul Faure supported the appeasement policy.
After the Battle of France in 1940 he rallied to Vichy, which led to his being expelled from the SFIO in 1944.