From Longman Business Dictionary
blacklistblack·list /ˈblækˌlɪst/ noun [countableC] a list of people, organizations, or countries that are disapproved of and that people avoid doing business with, for example because they are dishonestThe companies had been placed on the blacklist after being accused of offering kickbacks to win a contract.
—blacklist verb [transitiveT]The company’s near-monopoly of television has enabled it to blacklist artists who deal with its rivals.