Pretty sure you're not allowed to "name and shame" on these forums.
1. While participating on the Community Sites, you must respect the rights of others to participate in the community. To this end you may not harass, defraud, threaten or cause distress and/or unwanted attention to other members or Turbine staff. This includes, but is not limited to:
Name-calling or other insults
Posting or commenting with the intent of provoking ("trolling") another user or users
Flaming another user for their spelling or grammar
Bringing disagreements with someone into unrelated threads or blog posts/comments
Creating a thread, post, or comment on any of the Community Sites that calls out another player(s) for their actions in the game
But yea, don't trust Bilbo. He ninjas all the rare ring drops.
Well, you *can* name names, but the thread will be locked when a moderator gets around to it, and you'll get an infraction.
There are definitely times when it's worth the infraction to spread the word about a ninja/cheat/thief/scammer, but there's no way you're gonna be able to maintain a running list.
Work like no one is watching, dance like you don't need the money...