Juggalo Documentary: A Family Underground by Jack Burden How many artists can boast that they have an entire musical festival to their name? Or a giant family of underground followers. Very few, but Insane Clown Posse can! [youtube]http://www.youtube.com/watch?v=2Xv76qiJFJg[/youtube] Gathering of the Juggalos is one of the largest music festivals in the country, and has been…