 Lefebvre was mayor of Saint-Adelphe, Mauricie in 1977 and again from 1985 to 1993, where he laid the groundwork for a major water and sewage project carried out by his successor.He was elected in the Champlain electoral district under the Bloc Québécois (BQ) party in the 1993 and 1997 federal elections, thus serving in the 35th and 36th Canadian Parliaments before leaving Canadian politics.In late 1998 after he was arrested for drunken driving for the third time, Lefebvre made the decision to leave the BQ caucus to sit as an Independent.