As part of the
Charbonneau Commission, the
Permanent Anti-Corruption Unit () inquired and searched Vaillancourt's residence for evidence of corruption, as well as Laval City Hall and two other administrative buildings on October 4, 2012. The inquiries occurred in a wide search for contracts which were attributed during Gilles Vaillancourt's mandate. On October 24, 2012,
Operation Hammer subjected the Mayor Vaillancourt to more raids. Police from the
Sûreté du Québec also raided more than ten safety deposit boxes rented by Vaillancourt at various financial institutions. Later that same day, Vaillancourt announced that he would be temporarily leaving his function as mayor for health reasons. On November 9, 2012, Vaillancourt resigned as mayor and denied all of the corruption allegations against him. On May 9, 2013, Vaillancourt was arrested at his home by police, along with 36 other people, and charged with 12 charges that included fraud, corruption, money laundering and gangsterism. In the subsequent election to name his successor at Laval city hall, candidate Claire Le Bel went public on Radio Canada with a recording alleged to be that of Gilles Vaillancourt offering to fund her campaign with cash from questionable donors. Le Bel was subsequently placed under police protection after these revelations. On December 1, 2016, Vaillancourt, as part of a plea deal, pleaded guilty to fraud, breach of trust and conspiracy for actions of corruption in awarding city construction contracts between 1996 and 2010. On December 15, he was sentenced to six years in prison and ordered to pay $9 million in restitution to the city from a Swiss bank account and other assets. In November 2017 Vaillancourt was granted day parole, and on December 6, 2018, was granted full parole. ==References==