Addyston Pipe and Steel Company v. United States
In Addyston Pipe and Steel Company v. United States, 175 U.S. 211 (1899), the petition alleged that the defendants were practically the only manufacturers of cast iron within thirty-six States and Territories, that they had entered into a combination by which they agreed not to compete with each other in the sale of pipe, and the territory through which the constituent companies could make sales was allotted between them.
The Supreme Court held that the agreement which, prior to any act of transportation, limited the prices at which the pipe could be sold after transportation, was within the law.
Mr. Justice Peckham, delivering the opinion, said (p. 242):
"And when Congress has enacted a statute such as the one in question, any agreement or combination which directly operates not alone upon the manufacture but upon the sale, transportation and delivery of an article of interstate commerce, by preventing or restricting its sale, etc., thereby regulates interstate commerce."