From the publisher's website
A Web Enhancement for the Forgotten Realms Underdark
In the Underdark, countless organizations and individuals strive for goals ranging from survival to supremacy. The affiliations these creatures form are based on a variety of factors, including race, geography, and local customs. Grimlocks, suspicious of all other races, tend to operate in closely allied packs. A community of drow, on the other hand, has many different factions based on House and status.
Few groups look beyond their myopic worldview to see the Underdark as a whole. Three organizations that are exceptions to this rule are described below. All three count many different races and cultures among their members.
Though written with the FORGOTTEN REALMS Campaign Setting in mind, these organizations could fit well into a regular D&D campaign with only minor modifications.