The only two names that can even be in consideration here are Bischoff and Vince. No other authority figure or GM come close. We've seen so many GM's and authority figures over the years. Some have been good, others have been bad, while some have just plain been incredibly annoying. Vince for obvious reasons should be in the poll and be battling for the #1 spot with Bischoff. Most everyone knows he has the final say in the federation in real life, which has helped make his evil boss character so believable in the role.... and that's coming from someone who has grown tired of the character.
Bischoff is the only other one that comes to mind for an answer, he ran the show in a way what was both controversial and interesting. Unlike Vince he wasn't the real life owner, so he did that much better of a job of having to step up to make himself believable in the role. That's why I went with Bischoff for my response. He didn't have the advantage of being the real owner like Vince did, and still is the other candidate for the best authority figure the federation has ever seen. Anyone else including those who did a good job still was unable to live up to the standard that he set. That, or they overstayed their welcome like Vickie/Long or completely sucked.