You should say the names:

I left this as an HN comment but think it worth leaving here too: you should name everyone involved. I understand why you didn’t, but people can only get away with this shit because they do it anonymously and no one talks to each other.

This is a much lesser example, but years ago my former landlord threatened to kill me over a small claims court case (http://jakeseliger.com/2010/08/28/dont-rent-an-apartment-from-navid-abedian-in-tucson-arizona-or-how-i-learned-to-be-wary-of-lawsuits if you’re curious) and I wrote a post about what happened using his real name. Perhaps not surprisingly, since then I’ve gotten two emails thanking me for the story — one from someone who’d rented from him and had a bad experience and one from someone who avoided him.

In general it’s a good idea to keep non-public conversations non-public, but when the people starting those conversations rely on them in order to do nasty stuff the principle should no longer apply.