Venatori Umbrorum
An ancient order of humans dedicated to fighting the darker aspects of the supernatural. What they lack in magical or supernatural powers, they make up for in political influence, knowledge, and conventional firepower. Very little is known about the Venatori; Harry describes them as being "like the Masons, but with flame throwers." While they have some armed assets, they excel at using their influence in society to hinder the movement of supernatural predators such as vampires. The Venatori Umbrorum have been credited with freezing bank accounts, cutting supply lines, exposing mortal collaborators, and even going so far as assassinating or kidnapping human agents of the Vampire Courts. They are allied with the White Council in the war against the Red Court. The order's name, Venatori Umbrorum, is Latin, and translates to "The Hunters of Shadows". The group acts as unwitting cover for an even more secretive group referred to simply as the Venatori (Hunters in Latin) who specifically exist to stamp out knowledge of demonic gods, a task they call the Oblivion War.
The Venatori founded the Venatori Umbrorum as their foot soldiers. They gave them the name Venatori Umbrorum. There are approximately 5,000 Venatori Umbrorum and 200 Venatori. Thomas Raith, Harry Dresden's vampiric half-brother, and his sister Lara are among the Venatori.
The novelette "Backup: A Story of the Dresden Files" describes relationship between the Venatori and Venatori Umbrorum in detail.
Read more about this topic: List Of The Dresden Files Groups