Apparently, literary agent [[Barbara Bauer]] has sued a number of people and organizations, including the Wikimedia Foundation, for defamation because of their involvement in making or publicizing allegations that Bauer's services are a scam because she insists on payment up front from authors (where normal industry practice is for agents to collect only after the author's works sell) and has apparently sold few or none of her clients' works to anything other than vanity presses. She has made it onto the Science Fiction Writers of America's "20 worst agents" list (they're another of the defendants in the suit). She has a long record of threatening suits against sites and forums that criticize her, at one point demanding a billion dollars for unauthorized use of her name as the title of a forum thread asking a question about her business practices. http://forums.writersweekly.com/viewtopic.php?p=44820
If anybody's interested, the suit is docket number L-001169-07 in Monmouth County, New Jersey, where it can be looked up here: http://www.judiciary.state.nj.us/acms/disc/CV0227W0E.ASP It's one of the many court sites that make it a pain to link to their stuff because they use a form-post interface for document retrieval.