vigilante
//ˌvɪdʒ.ɪˈlæn.ti//
Noun
vigilanteSingular
vigilantesPlural
1
A person who takes the law into their own hands, punishing or seeking to prevent crime without legal authority.
The vigilante patrolled the streets at night, trying to stop crimes before the police arrived.
2
A member of a self-appointed group that undertakes law enforcement without official authority.
The vigilantes patrolled the neighborhood at night to prevent crime.