Same word as ex-con:

bad actor, black marketeer, blackmailer,con,convict, crook,culprit,delinquent, desperado, deuce, evildoer,ex-con, felon, fugitive,gangster, guerilla,heavy, hood, hoodlum,hooligan, hustler, inside person, jailbird, lawbreaker, malefactor, mobster, mug,musc