 During the Dreyfus affair, he founded the Anti-Militarist League (1902) "and, along with Paraf-Javal, founded the “Causeries populaires”, public discussions that met with great interest throughout the country, contributing to the opening of a bookstore and various clubs in different quarters of Paris".In 1905, Libertad founded what was probably the most important individualist anarchist journal, "L’Anarchie", which included among its collaborators André Lorulot, Emile Armand, and Victor Serge and his companion Rirette Maitrejean.The French theorist of the Situationist International Raoul Vaneigem reports that Libertad gained notoriety for a call to action in which he "invited citizens to burn their ID papers and to become humans again, refusing to let themselves be reduced to a number, duly filed in the statistic state inventories of slaves."