United States v. Grace

A federal statute, 40 U.S.C. § 13k, banned carrying flags, banners, signs, or leaflets designed to bring public attention to any "party, organization, or movement" onto Supreme Court grounds or into the building, effectively prohibiting parades, picketing, or lobbying there. The statute was challenged on First Amendment grounds, and the Court specifically considered whether the ban extended to the public sidewalks bordering the Court.