I can think of two right off the bat.
TMMI and GSPG-----Talk about sagas!!
TMMI......mafia, suicide (remember the Iron Butterfly...Taylor Kramer, one of the members of that group, was working on some type of futuristic energy and ran his truck off a cliff. Was missing for MONTHS before the truck was found. Rumors were mafia hits...it just went on and on and on) and then a former officer from MCI (the guy who set up Prodigy) began dealing with all sorts of I guess you'd call it occult matters.
GSPG.....infighting galore, bankruptcy, power wrestling.
Those two make PHGI look like a walk in the park.