What is Black-List?

Legal Definition
A list of persons marked out for special avoidance, antagonism or enmity on the part of those who prepare the list or those among whom it is intended to circulate; as where a trades-union "blacklists" workmen who refuse to conform to its rules or where a list of insolvent or untrustworthy persons is published by a commercial agency or mercantile association. Masters v. Lee, 39 Neb. 574, 58 N. W. 222; Mattison v. Railway Co., 2 Ohio N. P. 279.
-- Black's Law Dictionary
Legal Definition
a list of persons that are to be avoided for one reason or another.