Agropur is a Canadian cooperative headquartered in Longueuil, Quebec, Canada. Agropur sells dairy products under its own Natrel division, an industrial division, fine cheese division and with Ultima Foods Incorporated. Some milk operations were acquired from Ault Foods. Agropur and Natrel came into the national spotlight in January 2005 after a group of Torontonians became ill after drinking contaminated chocolate milk. These people filed a class action lawsuit against the companies.