32 CFR 1903.17: Soliciting, vending, and debt collection.
Commercial or political soliciting, vending of all kinds, displaying or distributing commercial advertising, collecting private debts or soliciting alms on any Agency installation is prohibited. This does not apply to:
(a) National or local drives for funds for welfare, health, or other purposes as authorized by Title 5 CFR parts 110 and 950 as amended and sponsored or approved by the Director of Central Intelligence, or by his or her designee.
(b) Personal notices posted on authorized bulletin boards and in compliance with Central Intelligence Agency rules governing the use of such authorized bulletin boards advertising to sell or rent property of Central Intelligence Agency employees or their immediate families.