Wikipedia:Contributor copyright investigations/De Administrando Imperio

If contributors have been shown to have a history of extensive copyright violation, it may be assumed without further evidence that all of their major contributions are copyright violations, and they may be removed indiscriminately in accordance with Copyright violations. However, to avoid collateral damage, efforts should be made when possible to verify infringement before removal.

Additional

 * SEE ALSO Contributor copyright investigations/De Administrando Imperio 2