criminal, felon, crook, outlaw, malefactor

someone who has committed (or been legally convicted of) a crime

• accessory, accessary — someone who helps another person commit a crime
• arsonist, incendiary, firebug — a criminal who illegally sets fire to property
• blackmailer, extortioner, extortionist — a criminal who extorts money from someone by threatening to expose embarrassing information about them
• bootlegger, moonshiner — someone who makes or sells illegal liquor
• briber, suborner — someone who pays (or otherwise incites) you to commit a wrongful act
• conspirator, coconspirator, plotter, machinator — a member of a conspiracy
• desperado, desperate criminal — a bold outlaw (especially on the American frontier)
• fugitive, fugitive from justice — someone who is sought by law officers; someone trying to elude justice
• gangster, mobster — a criminal who is a member of gang
• highbinder — a corrupt politician
• highjacker, hijacker — someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination
• hood, hoodlum, goon, punk, thug, tough, toughie, strong-armer — an aggressive and violent young criminal
• kidnapper, abductor, snatcher — someone who unlawfully seizes and detains a victim (usually for ransom)
• mafioso — a member of the Mafia crime syndicate in the United States
• moll, gun moll, gangster's moll — the girl friend of a gangster
• murderer, liquidator, manslayer — a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)
• probationer, parolee — someone released on probation or on parole
• pusher, drug peddler, peddler, drug dealer, drug trafficker — an unlicensed dealer in illegal drugs
• racketeer — some who commits crimes for profit (especially one who obtains money by fraud or extortion)
• raper, rapist — someone who forces another to have sexual intercourse
• recidivist, repeater, habitual criminal — someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)
• scofflaw — one who habitually ignores the law and does not answer court summonses
• smuggler, runner, contrabandist, mooncurser — someone who imports or exports without paying duties
• thief, stealer — a criminal who takes property belonging to someone else with the intention of keeping it or selling it
• traitor, treasonist — someone who betrays his country by committing treason
• violator, lawbreaker, law offender — someone who violates the law
• Bonney, William H. Bonney, Billie the Kid — United States outlaw who was said to have killed 21 men (1859-1881)
• James, Jesse James — United States outlaw who fought as a Confederate soldier and later led a band of outlaws that robbed trains and banks in the West until he was murdered by a member of his own gang (1847-1882)
• MacGregor, Robert MacGregor, Rob Roy — Scottish clan leader and outlaw who was the subject of a 1817 novel by Sir Walter Scott (1671-1734)

• wrongdoer, offender — a person who transgresses moral or civil law