banish, ban, ostracize, ostracise, shun, cast out, blackball (verb)

expel from a community or group

ostracize, ostracise (verb)

avoid speaking to or dealing with

"Ever since I spoke up, my colleagues ostracize me"

ostracize (Verb)

To exclude (a person) from society or from a community, by not communicating with them or by refusing to acknowledge their presence; to refuse to talk to or associate with; to shun.

ostracize

Ostracism (Greek: ὀστρακισμός, ostrakismos) was an Athenian democratic procedure in which any citizen could be expelled from the city-state of Athens for ten years. While some instances clearly expressed popular anger at the citizen, ostracism was often used preemptively. It was used as a way of neutralizing someone thought to be a threat to the state or potential tyrant, though in many cases popular opinion often informed the expulsion. The word "ostracism" continues to be used for various cases of social shunning.