The Parti Municipal emerged from a split in mayor Raymond Renaud's governing Ralliement de Saint-Léonard (RdSL) party in May 1988, when Frank Zampino and seven other RdSL councillors resigned to sit as independents.
Zampino's rebel group formed a majority on council and dominated its legislative activities for the next two years, even though Renaud continued to serve as mayor.
[1] He defeated Renaud in the mayoral contest, and the party won ten out of twelve seats on council.
[2] The Parti Municipal faced little challenge to its political dominance of Saint-Leonard in the 1990s.
[5] The PM was formally dissolved in 2001, when Saint-Leonard became part of the newly amalgamated City of Montreal.