The head of Perverted Justice, the group hired by Dateline NBC to lure men seeking sex with minors in front of hidden cameras for its "To Catch a Predator" series, has been barred indefinitely from the Wikipedia website, according to Chatmag News, a website that tracks activities on chat sites. Xavier Von Erck was accused of attempting to remove critical messages concerning his organization and "flaming" critics (accusing some of being pedophiles), and using invectives against critics in violation of rules of the Wikipedia site. Von Erck responded with a commentary on the Perverted Justice website accusing Wikipedia of being "a corporate sex offender" and charging that articles on the site dealing with pedophilia have "been heavily targeted and edited by the online pedophile activist movement."