Definitions

brig·and
noun
  1. a member of a gang that ambushes and robs people in forests and mountains.
gang·ster
  1. a member of a gang of violent criminals.
    "gangsters threatened to kill him if he did not cooperate in the theft"
hoo·li·gan
noun
  1. a violent young troublemaker, typically one of a gang.
hood·lum
noun
plural noun: hoodlums
  1. a person who engages in crime and violence; a hooligan or gangster.
    "they were the “professional” gangsters of New York, hoodlums and racketeers"