Sometimes called "Blackballing," this practice is prohibited by the Constitution and by a number of U.S. and state laws. Actors sometimes erroneously believe that they will be "blacklisted" if they refuse to join the union, but such practice is unquestionably unconstitutional and illegal.

This is the process of noting a domain, IP range, or even an individual as being a repeating breacher of search engine guidelines.

Circulating or publishing a person's name with the intention of interfering with his/her chances for employment.