sunshadow21
Explorer
That elementals are bound is presented in the way that the buildings in Sharn being made of stone is presented, which is to say that it is presented as if it isn't of any consequence to anyone's campaign beyond just being there so that an answer of some kind is present should anyone happen to ask.
Probably because being a major element of the many of the Dragonmarked houses, it's wrapped up in the politics of those houses, which is not fully described and left to the DM to highlight what political concerns are highlighted.
Trying to have an independent group that isn't part of the Dragonmarked houses would be near impossible; even if such a group were able to find out enough details to put the cause together, their lack of clout as an outsider force would basically relegate the effort to the sidelines of society. They could have put a S.P.E.W. type organization in the setting, but without some kind of political clout to help it survive against the inevitable pushback from the Dragonmarked houses that rely on those elementals as a key part of their business strategy. S.P.E.W. survived mostly because it didn't directly threaten anyone and those targetted usually just laughed it off. Such an organization to protect elementals in Eberron would have a much, much, much stiffer path of resistance. Anybody doing so from within the Dragonmarked houses, such as the example above, is likely to have a difficult time making it a key priority without running into dozens of other issues that touch upon the subject; negotiating vs forced binding is probably the most that anyone is going to be able to do openly without causing all sorts of other disruptions.
In the end, there isn't the kind of group you seek because there's no base resource for a permanent group like it to build off of. Everything about it would have to be tied into the Dragonmarked houses somehow in order for it to have any meaning and thus end up getting pulled into the larger political scene that those houses have to deal with. Rather than expecting a completely independent group dedicated to that cause, it would be far easier to treat it as an ongoing political issue that is part and parcel of Eberron politics. A lot of people could be very concerned about it, but simply lack the resources or ability to make it a primary issue, which is where the PCs would be able to help, either by providing resources or by providing an outlet that could force it to be a more urgent matter.
So the storyline is very much there as the campaign is written, even if it isn't actively supported with some formal organization pushing it; it's part of the politics of the world that you as a DM or player can easily bring forward as being one of the larger concerns of that particular campaign. As a standalone concern, though, it's not going to be able to get enough traction to warrant specific mention in most of the official material; it's too tightly wrapped up with the Dragonmarked houses for that to truly work as an NPC organization separate from the houses and politics already presented in the material.