American Manufacturing Co. v. City of St. Louis

The question is whether an 'ordinance of the City of St. Louis levying against manufacturers, especially as against plaintiff in error, a West Virginia corporation, a tax imposed as a condition of the grant of a license to carry on a manufacturing business in that city, but the amount' of which is ascertained by and proportioned to the amount of sales of the manufactured goods, whether sold within or without the State, and whether in domestic or interstate commerce, is void as amounting to a regulation of •commerce among the States and thus entrenching upon the power of the national Congress…