Vigilantes

In modern terms, a vigilante is anyone who takes the law into their own hands. Vigilantes often operate in secret. The term vigilante stems from the name "Vigiles Urbani" given to the nightwatchmen of Ancient Rome, who were tasked with fighting fires and keeping a lookout for runaway slaves and burglars.

This category may inappropriately label persons. See Wikipedia:Categorization and WP:BLPCAT for advice on how to apply categorization to articles relating to people. See also the policy at Wikipedia:Categorizing articles about people regarding categorization by ethnicity, gender, religion, sexuality, or disability.