After having written his first book, L'Homme Qui Vient (The Coming Man), he met the nationalist and monarchist writer Charles Maurras and became a member of his Action Française, where he continued to follow the workers' movement.

[2] In 1911, he created the Cercle Proudhon, a national syndicalist group, and took direction of the publishing house of the Action française, the Nouvelle librairie nationale, in 1912.

After some initial success (it was joined by such extremist figures as Hubert Lagardelle and Marcel Bucard), it disappeared in 1928, when Valois had already been excluded from the party.

[4] During the second Cartel des gauches (Left-wing Coalition), the party published the Cahiers bleus (1928–1932), which hosted essays by widely-different personalities, including Marcel Déat (a future neo-socialist who had been excluded from the French Section of the Workers' International (SFIO) who would later be a collaborationist), Bertrand de Jouvenel (co-founder of the Mont Pelerin Society, a liberal organisation that still exists), Pierre Mendès France (one of the young guards, or jeunes loups, of the Radical-Socialist Party who would become French Prime Minister during the Fourth Republic), and Edouard Berth.

After the 6 February 1934 crisis, Valois founded Le Nouvel Age ("The New Era"), which he presented as a left-wing review, along with the Cahiers bleus.