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Whether an agreement between two local newspapers to cease competition, fix prices and pool profits violated the Sherman Antitrust Act

"This case . . . raises questions concerning the constitutional power of a state to apply its antitrade restraint law to labor union activities, and to enjoin union members from peaceful picketing carried on as an essential and inseparable part of a course of conduct which is in violation of the state law. The picketing occurred in Kansas City, Missouri. The injunction was issued by a Missouri state court."