vig·i·lan·te
noun/ˌvɪdʒɪˈlænti/
/ˌvɪdʒɪˈlænti/
(sometimes disapproving)- a member of a group of people who try to prevent crime or punish criminals in their community, especially because they think the police are not doing this
（尤指认为警方不力而自发组织的）治安会会员 - vigilantes patrolling the streets
民警在街上巡逻 - vigilante groups
自发的治安小组 - The neighbours have formed a vigilante group to keep a watch on the car park.
邻居们组成了一个治安小组来监视停车场。 - Two vigilantes who took the law into their own hands were cleared yesterday of murder.
昨天，两名自行执法的义务警员被洗清了谋杀罪名。
Oxford Collocations DictionaryVigilante is used before these nouns:- justice
Word Originmid 19th cent.: from Spanish, literally ‘vigilant’. - vigilantes patrolling the streets