36 C.F.R. § 504.9 Placards, signs, banners and flags.
Title 36 - Parks, Forests, and Public Property
The displaying or carrying of placards, signs, banners, or flags is prohibited unless officially authorized.
Title 36: Parks, Forests, and Public Property
PART 504—RULES AND REGULATIONS GOVERNING SMITHSONIAN INSTITUTION BUILDINGS AND GROUNDS
§ 504.9 Placards, signs, banners and flags.
