noun

a list of people or things that are regarded as unacceptable or untrustworthy and should be excluded or avoided.

he was placed on a blacklist which meant he was unable to get credit

verb

put on a blacklist.

workers were blacklisted after being quoted in the newspaper

boycott,ostracize,avoid,embargo,put/place an embargo on,consider undesirable,steer clear of,ignore,refuse to employ,black