Vigilante(noun)
A member of a self-appointed group of citizens who undertake law enforcement in their community without legal authority
Hindi meaning:निगरानी समिति सदस्य
Synonyms: Chaperone, Overseer, Watchdog, Custodian
Example: The danger of self-appointed vigilantes is that they sometimes trouble innocent people.
Trick to remember: Ye aunty bi Vigilante hai. 
