Whilst a student at Sciences Po, he created his own movement, Action nationaliste, which was classified as neofascist. In 1969, he organized a meeting at Sciences Po celebrating the 50th anniversary of the Fasci Italiani di Combattimento's founding by Mussolini. In May of that year, he was arrested after a left-wing student was grievously wounded during a fight between student activist groups. Malliarakis, who had been knocked out during the fight, was found unconscious by police forces and put in detention. He was eventually freed three weeks later.
