Wikipedia has banned the Church of Scientology from editing any of its articles!

The ban centered itself around over 400 articles about the controversial religion which had been subject to a series of long-standing and heated edit wars. The conflict was between numerous editors from the church itself who methodically used multiple user accounts to deceptively silence Scientology critics who had been citing their own source materials. Though Wikipedia prides itself on being open and inclusive, enough was enough - and many of the users involved were banned on an individual basis for six months!

(source)