Mordrel returned to France incognito in 1972 and continued writing for "La Bretagne Réelle" as "Otto Mohr" (a name he had used in 1940), as well as editing several books - including a history of the Waffen-SS ("Waffen SS d'Occident"). In the 1980s, he was among the founders of "Kelc'h Maksen Wledig" ("Emperor Maxentius' Circle"), together with such figures of the far right as Yann Ber Tillenon and Georges Pinault; later, he was active in the GRECE, an organization associated with extremist politics, led by Alain de Benoist. Nonetheless, in the 1981 presidential race, Mordrel backed Socialist candidate François Mitterrand.