The Syndicate is one such guild, boasting a membership of 1,200 players and a 95% retention rate. The organisation celebrates its 16th anniversary this week, having been born as an online community before the release of Ultima Online.
The Syndicate is currently active in Ultima Online and World of Warcraft, having previously been active in EverQuest, Shadowbane and other games. All members agree to follow a charter that forbids stealing, cheating, non-consensual player-killing, and immature behaviour. The Syndicate takes its identity so seriously that it's even trademarked its name and has worked with MMO companies to rename guilds using it. Developers have in turn taken advantage of The Syndicate's huge community size and code of conduct to beta test upcoming games. With its 16th birthday behind it, the guild predates most MMOs on the market today and is still going strong.