Career
He was also known as Pax Plante. Between 1940 and 1950, he waged war against organized crime, vice and corruption in Montreal. In 1948, Plante denounced corruption inside the police force.
With the assistance of the journalist Gérard Filion, he published a series of articles in Le Devoir (from November 1949 to February 1950) where he affirmed that police "protection" encouraged the activities of the underworld.
With Jean Drapeau, he took part in the Caron Inquiry, which led to the arrest of several police officers.