<p>There are two levels of Underground. In a few cases, the chapters are recognized by the national organization and still follow the rules of the nationals (and can still get in trouble, get shut down, etc). although they are not recognized by the university, the entire Greek system is generally ignored so that the university reduces their liability.
Now sometimes groups will be kicked off of campus, or disbanded by the national groups. They may be local fraternities with almost no oversight. That is a problem waiting to happen. Real hazing, no rules-Lord of the Flies. </p>