Gateways in the Chinese wall

In business, a Chinese wall is an information barrier that separates one part of the company from another. In newspapers, there's a Chinese wall between the journalism part (the newsroom) and the business part (advertising), and usually also the opinion part (the editorial page). Outsiders generally don't understand this, but left hand really doesn't know what the right hand is up to, and what's more, often don't want to know.