Former activist of the Fédération des étudiants nationalistes (Federation of Nationalist Students), Lefebvre also contributed to Cahiers universitaires, the movement's newspaper. In 1968, he became one of the founders of the Groupement de recherche et d'études pour la civilisation européenne (GRECE). After that, he joined the Le Figaro Magazine (Figaro diary) with Alain de Benoist and other "neo-rightists". He founded the ephemeral Magazine hebdo while managing the groupe Media and L'Histoire magazine.
