Numerous activists contributed to the paper, including Jean Grave, Bernard Lazare, Albert Libertad, Octave Mirbeau, Saint-Pol-Roux, Tristan Bernard, Georges Darien, Lucien Descaves, Sébastien Faure, Félix Fénéon, Émile Henry, Camille Mauclair, Émile Verhaeren, and Adolphe Tabarant.
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In 2002, as an anarchist, Libertad organized a new version of the En-Dehors, collaborating with Green Anarchy and including several contributors, such as Lawrence Jarach, Patrick Mignard, Thierry Lodé, Ron Sakolsky, and Thomas Slut.
Dehors Novembre (1998), the last LP from the group, was written and performed with the help of the Diouf brothers, whose background from Senegal added a new element to the band's music.