[1] Starting in 1902 the French pacifist societies began to meet at a National Peace Congress, which often had several hundred attendees.

[3] At the 1904 LDH Congress Le Foyer proposed an inalienable right of people to freely dispose of themselves as individuals.

He wanted to abolish "collective slavery" and said the voice of the LDH was not just raised for Europe but also for Armenia and Macedonia, both under Turkish control at the time.

He was involved in discussions of the Hague Conference, the General Tariff and the situation of French merchants settled at Lessé on the middle Congo.

[1] He remained secretary of the executive committee of the Radical party and secretary-general of the Permanent Delegation of French Pacifist Societies.

Lucien Le Foyer was among the French attendees, as were Jeanne Mélin, Théodore Ruyssen, Alfred Vanderpol, Gaston Moch and Émile Arnaud.

[9] Lucien Le Foyer remained interested in politics, and after World War II (1939–45) became president of the executive committee of the National Peace Council (Conseil national de la paix) which called for a pacifist solution to conflicts and an extension of the powers of the Assembly of the Council of Europe.