The Champlain Bridge Massacre was an incident that occurred on May 23rd, 1985 in Gatineau, Canada. During the "Day of Demonstration" organized by the Progressive Alliance and Bloc Quebecois to demand the release from prison of political prisoners such as Brian Mulroney, Joe Clark and Jacques Parizeau, protestors in Gatineau began crossing the Champlain Bridge across the Ottawa River into Ottawa, where they planned to finish their protest in front of the Proletarian Congress and Socialist Party headquarters.