Carroll v. Town of Princess Anne, 393 U.S. 175 (1968), was a United States Supreme Court case in which the Court held that a state cannot preemptively prohibit persons from holding a public meeting, without first notifying the persons involved, and providing the persons an opportunity to argue the decision, unless moving party can show (per the equivalent of today's Federal Rule of Civil Procedure 65) (1) that they made efforts to give to notice, and (2) explain to the court the reasons why such notice should not be required. The National States Rights Party won the case unanimously.