I thought the Supreme Court ruled that direct shipment of wine was legal?
No, in the case heard by the U. S. Supreme Court, the Court ruled that a state cannot discriminate with regard to regulation of out-of-state wineries. In other words, if an in-state winery can ship and sell directly to a consumer, then an out-of-state winery has the same privilege. In Mississippi, in-state wineries cannot ship directly to a consumer so there are no discriminatory practices. The Court further ruled that the states have the ultimate authority to regulate wine and alcohol as they see appropriate.
