Yves de La Brière was an influential French Jesuit theologian and author. He was a monarchist and supported the League of Nations. He was opposed to war, but wrote on the Christian tradition of just war. He was involved in the controversy in 1926 over the relationship between the Catholic church and the Catholic monarchist Action Française, which the Pope refused to support.

Count Bernard de Vésins was a French soldier, essayist, practicing Catholic and right-wing Action Française militant. He was hostile to Freemasons, Jews and socialists, whom he considered to be working together in conspiracy to undermine the traditional Catholic values of France. In the 1920s he was President of the Ligue d'Action Française during a period when the Catholic Church was disassociating itself from the movement.