By what looks like popular demand on the Society for Creative Anachronism thread, I'm linking a three-part account of three roles that supposedly exist within every lasting subculture or "volunteer-dominated" organization. The author has no proper authority at all but has personally observed many subcultures in the wild.
These roles do not represent exclusive personality types as such. A person who serves as Authenticity Cop in one community may theoretically serve as Fun Maven or even Dream Nazi elsewhere.*
Dream Nazis: Supply vision for the group. Brad describes this as inherently promoting a Golden Age myth of a glorious past. Hopefully this reflects the term's origins in the SCA and not any practical necessity.
Authenticity Police: Seek accuracy and nitpick perceived mistakes. You know this one already.
Fun Mavens: Work up a sweat doing free lifting or other labor for the organization, then enjoy 'a few' cold beers with their comrades. (I find it amusing that I took a while to think of the right word at the end there.) Brad argues that in addition to doing all that work, Fun Mavens sustain the organization by recruiting.
*I wonder if Eliezer doesn't wear two hats right here, never mind at the SIAI.