I believe Sigma Kappa was established and folded in the same year at GMU back in the 70s. I heard from one of my greek life nerd friends that there used to be a chapter of Beta but I'm not sure when they left or for what reason (our greek system isn't the strongest in the world). Phi Mu folded over Christmas break my freshman year, which stunk because I was really interested in them. Phi Kappa Sigma (simply known on campus as the Skulls) had their charter revoked for financial reasons and I believe their house was condemned, but don't take my words as the bible. My own chapter was in danger of closing when I pledged, but we were never told that. Of course, my pledge class was the largest in years for informal recruitment (13) so our chapter is thriving again. We ain't goin NOWHERE!