Racketeer

Noun

 * 1) one who commits crimes (especially fraud, bribery, loansharking, extortion etc.) to aid in running a shady or illegal business.
 * 2) one who instigates or has involvement with a racket.

Verb

 * 1) to carry out illegal business activities or criminal schemes.
 * 2) to commit crimes systematically as part of a criminal organization.

Thesaurus
Judas, Mafioso, bad person, bandit, betrayer, black marketeer, blackmailer, bloodsucker, bootlegger, brigand, convict, criminal, crook, dacoit, dealer, deceiver, delinquent, desperado, desperate criminal, double-dealer, drug pusher, evildoer, extortionist, felon, fugitive, gallows bird, gangster, gaolbird, gray marketeer, harpy, hoodlum, jailbird, lawbreaker, leech, malefactor, malevolent, malfeasant, malfeasor, misfeasor, mobsman, mobster, moonshiner, outlaw, predator, profiteer, public enemy, pusher, quisling, raptor, scofflaw, shakedown artist, shark, sinner, swindler, thief, thug, traitor, transgressor, two-timer, vampire, villain, vulture, worker of ill, wrongdoer