Black book

Usage area

This unofficial expression is used in the field of gambling along with the phrase "blacklist", meaning, in fact, the same thing. 

Description

Black Book is the nickname of the black list of customers who are forbidden access to the gambling establishment.

Also, this expression is often called "Griffin Book». This is a famous list of players potentially posing a danger to the casino. It was compiled by the American organization Griffin Investigations. 

Related terms

Griffin Book