From 1920 he served as editor of the newly formed Revue Universelle, a magazine closely associated with Action Française which worked to spread Christian political philosophy.

He published two volumes of Jugements that critically analysed the moral teachings of numerous writers, such as Ernest Renan and André Gide.

Massis' political writings expressed his concerns over what he viewed as threats to post-World War I French society, including Bolshevism and Oriental mysticism.

[6] He devoted himself to biographical studies of Ernest Renan, Maurice Barrès, Charles Maurras and António de Oliveira Salazar.

Still a follower of the integralist and nationalist philosophy of the Action Française after the war, his writings from this period reflect his continued disdain of Nazism in Germany and Bolshevism in the Soviet Union.