Forum:How do I delete ALL these categorories and their members?

the link to the wikia

http://lifeiscrimeitalia.wikia.com/wiki/Special:Categories

I need to delete ALL those and their members. I would also like to know how to remove the categorization of a page. Thanks.
 * Easiest way would be to use a bot. — 13:13, October 23, 2012 (UTC)