So a bit on the Sweepers for those who are actually interested in being a part of them: 

The Sweepers are an anonymous "Force" of Defenders of Justice and Vigilante. They have no loyalty to guild nor kings as a whole, meaning that anyone could potentially be targeted by the Sweepers. What makes them different from other nameless hordes is whom they hunt: True Sweepers only hunt down those have have been branded as Outlaws, players who prey on the weak and defenseless. Typically this means low levels under level 5 or so, but just about anyone can be a victim depending on the circumstances. And it's the Sweeper's duty to go out and protect those players as well as punish the Outlaws.

Of course, things aren't always so easy. While their free-roaming nature means that anyone can take up the cause of the Sweepers, it is for that same reason that many people can use the name of the Sweepers for evil purposes. Being a Sweeper is an ideal and not held in any actual code or law, so while anyone can take up the cause of a Sweeper, just about anyone can abuse it. Generally those who do not fill the idealized image of a Sweeper is not truly a Sweeper, and thus you are judged by your actions, not by your words. Hence why the Sweepers never organized.

Than again, the Sweepers as most know them is really just a cover, one that the original creator would at least sometimes play the part of. The creator of the Sweepers is Restu Goroshi, Dark Wraith, though she does not play the role of a leader or even takes responsibility as the propagator. She does, however, serve a role with the Sweeper that has some structure: The Erasers. Whereas Sweepers are just anyone willing to fight for justice, Erasers are less pleasant. Erasers are hackers within the Sweepers who are tasked to assign and find Outlaws, but in and out of the game. Erasers play a dark part of justice who "execute" particularly annoying Outlaws. The Erasers are often in league with one another, but again, they have no leader to answer to and often operate with their own agenda. What makes a person an Eraser is the ability to manipulate the system of Deep Ground, and the interest in condemning players to constant harassment of the Sweepers and the eventual removal from Deep Ground.

Some Sweepers may know of the existence of the Erasers (Such as Donny) and they are often the hitmen Erasers would call upon to eliminate players in real life. Rarely would an Eraser actually dirty their own hands eliminating Outlaws in real life due to the importance of their skills. They will however assist however they can to ensure their Sweepers get the job done.