In the case of Granholm v. Heald, the U.S. Supreme Court rules that the states cannot bar out-of-state shipments of wine to their residents, despite the provision of the Twenty-first Amendment, which leaves the regulation of liquor sales to the states. In this case, the Court strikes down state laws that discriminate against interstate commerce in violation of the commerce clause and concludes that such discrimination is neither authorized nor permitted by the Twenty-first Amendment.