40 U.S.C. § 6132 : US Code - Section 6132: Sale of articles, signs, and solicitation in Supreme Court Building and grounds

      It is unlawful - 
        (1) to offer or expose any article for sale in the Supreme
      Court Building or grounds;
        (2) to display a sign, placard, or other form of advertisement
      in the Building or grounds; or
        (3) to solicit fares, alms, subscriptions, or contributions in
      the Building or grounds.