In 1909 Gay abandoned teaching and obtained a job with Bloud & Cie, a publisher. He had met one of the owners, Edmond Bloud, through Le Sillon. Henri Bloud, Edmond's brother and co-owner of the publishing house, retired on 29 April 1911. He sold part of his share to Edmond Bloud, who now owned 60% of the enterprise, and part to Francisque Gay, who now owned 40%. The company name was changed to "Bloud et Gay". On 20 May 1911 Gay married Blanche Marie Fromillon. They would have six children. On 30 December 1922 Bloud & Gay became a
société anonyme, a publicly held company. Edmond Bloud was active in politics, and from 1924 reduced his involvement in the company to one day per week. In the 1920s and 1930s Gay was one of the leading polemicists for the Christian democratic movement. In 1924 he joined the
Popular Democratic Party (Parti démocrate populaire, PDP). That year he launched the weekly
La Vie Catholique (
Catholic Life). In 1926
La Vie Catholique defended
Pope Pius XI's condemnation of the far-right
Action Française. On 1 January 1927 the Pope sent a telegram to Gay thanking him for the courage of
La Vie catholique. In 1927 Gay founded the Volontaires du Pape (Volunteers of the Pope) to disseminate Social Catholicism throughout Europe, and arranged a large pilgrimage to Rome with this organization in 1929. Gay also founded ''L'Almanach catholique
, then in 1932 L'Aube (The Dawn''). ''L'Aube'' presented Christian democratic views, and was notable for the editorials of
Georges Bidault. In 1938 Gay and Bidault, who also belonged to the PDP, founded the New French Team (Nouvelles Equipes Françaises, NEF). The purpose was to pull together Christian Democrats against the rising dangers of Fascism. Gay's journalistic activity was reduced with the approach of
World War II (1939–45).
La Vie catholique was closed in 1938 and ''L'Aube'' closed in June 1940. ==World War II==