A New York state dairy farm is leading a class-action lawsuit in federal court in Vermont against the country’s largest dairy cooperative, Dairy Farmers of America (DFA), arguing that the organization has violated antitrust law and artificially lowered the price of raw milk. The lawsuit alleges that DFA has created a “monopsony,” a market in which many sellers have only a single buyer, across the dairy industry in Vermont and ten other states in the northeastern United States.