malefactor (n.)

• blackguard
• criminal
• crook
• culprit
• deceiver
• delinquent
• evildoer
• felon
• gangster
• knave
• lawbreaker
• malfeasant
• miscreant
• mobster
• offender
• outlaw
• racketeer
• rascal
• rogue
• scoundrel
• sinner
• thief
• transgressor
• villain
• wrongdoer