After being released, he returned to France and in 1920 joined the French Communist Party (PCF), quickly rising through the party - within a few years, he had become one of the PCF major leaders. In 1922 he became a member of the Presidium of the Executive Committee of the Comintern, and a year later was made Secretary of the French Federation of Young Communists. In 1923, Doriot was arrested for violently protesting French occupation of the Ruhr Area. He was released a year later, upon being elected to the French Chamber of Deputies (the Third Republic equivalent of the National Assembly) by the people of Saint Denis.