vigilante

/ˌvɪdʒəˈlænti/
noun
  1. A person who takes the law into their own hands, acting outside the legal system to punish or prevent crime.
    • In the movie, a vigilante hunts down criminals that the police cannot catch.
    • Vigilantes often cause more problems than they solve by bypassing the courts.
    • The town was divided over whether the masked vigilante was a hero or a menace.
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