This mysterious group of people is against Topaz and everything they stand for. At least, that’s what the corporation says. No one knows for certain that a full-on organized group even exists.
The heroes have uncovered small amounts of evidence pointing to an effort to harry the merchants in their endeavors. They found incriminating documents that state a large thieves guild in Heron was contracted to attack a supply-cave that Topaz was using. Additionally, they discovered that a powerful wizard was organizing the events in that area. While this does not prove that there is a giant effort to bring Topaz to the ground, it certainly proves that they have made at least a few enemies.