Libel and slander has been on the books as law for a very long time now. Yes you can use metaphorical language to criticize a well known figure--crazy, aggressive, intrusive, liar--whatever. But if you accuse him of belonging to illegal or subversive groups or maliciously and dishonestly accuse him of illegal activity in a way that harms his/her reputation, livelihood, choices, opportunity, you have grounds for legal recourse.It’s free speech. Something we take seriously here.