lets say theres 2 guys, guyA and guyB. Lets say GuyB is scammer, always getting money out of people when he says they get stuff in return, but they never do. can GuyA get sued if he makes a website with domain "guyB-scammer.com"? could GuyA get sued? as im tempted to make a website about GuyB as only certain people know he is, i think he should be know worldwide!
Just make sure you have full documented proof that will back up anything you say in a court of law. If you dont they can sue you and win, even if they are a scammer.