You may have seen the video a few years back. It took place backstage at a festival show, and Glenn Danzig was being a bit of a prima donna, and got into an altercation with the North Side Kings' Danny Marianino, who knocked him out cold:
Danzig fans went nuts and for years took to the internets and called Marianino (and his band) names - usually a variation of or an expression containing the word 'fags' - and he has written a tell-all book about the whole situation.
Vice.com scored an interview. I think it's probably a better read than a whole book; I fail to see how 200 pages can tell the tale better than one article, though, unless it's just a way to get back at every Danzig fan who ever wrote him an angry email individually, which is an endeavor I endorse (but won't read).