Black Book (gaming)
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"Black Book" is the nickname frequently used to refer to a list of persons who are unwelcome in casinos. The name comes from the fact that the persons listed in the "book" are essentially "blacklisted". The term can refer either to such a list officially maintained by a particular Gaming Control Board, or to the Griffin Book, whose information is shared by casinos throughout the gaming industry.
In the former case, persons listed are generally suspected of having, or known to have, ties to organized crime. Casinos are obliged by gaming regulations to exclude all such persons from entry, and can be subject to sanctions from the Gaming Control Board for failure to do so. In the latter case, listed individuals are generally suspected of being, or known to be, either advantage players or outright cheaters at the casino games themselves. Thus, casinos find it in their own economic best interest to exclude such individuals.