4 C.F.R. § 25.10
Posting or affixing materials, such as pamphlets, handbills or flyers, on bulletin boards or elsewhere in the GAO Building or on its grounds is prohibited, except as authorized by these rules and regulations or when such displays are conducted as part of authorized government activities. Distribution of materials, such as pamphlets, handbills or flyers is prohibited, unless conducted as part of authorized government activities. Any person or organization proposing to post or distribute materials in any part of the GAO Building or on its grounds shall first obtain a permit from the Comptroller General or his designee and shall conduct the posting or distribution in accordance with the guidelines provided by the Comptroller General or his designee. Failure to comply with those guidelines is a violation of these regulations.
4 C.F.R. § 25.10