One who robs others in a lawless area, especially as part of a group.
A runner who covertly joins a race without having registered as a participant.
An outlaw.
An aircraft identified as an enemy, but distinct from "hostile" or "threat" in that it is not immediately to be engaged.
One who cheats others.
To rob, or steal from, in the manner of a bandit.
One who breaks (violates) the law, a criminal.