State laws barring people from buying wine directly from out-of-state suppliers should be struck down as unconstitutional, the Supreme Court was told Tuesday, as it heard arguments in a case that could lead to sweeping changes on how alcoholic beverages are regulated and sold.

Justices heard arguments in three appeals involving laws in Michigan and New York that allow direct in-state, but not out-of-state, shipments. The dispute pits regulators and wholesalers against out-of-state wineries that want to sell alcohol to consumers, mostly over the Internet or by phone.