The Midwest Brotherhood
-Faction Leader: Willow Harkanin
-Locations: Bunker Beta, Bunker Gamma, Bunker Delta, Ruins of St. Louis, Kan City
For more about the history of the Midwest Brotherhood, follow this link:
http://fallout.wikia.com/wiki/Brotherhood_of_Steel_(Midwest)
While they are often referred to as "The Brotherhood of Steel" or just "The Brotherhood" for short, even the Brotherhood's initiates know that they are the Midwest Brotherhood -- decendents of the original Brotherhood of Steel that traveled west in search of technology of resources. Due to their unique situation, they diverged from many of the ideas in the codex, and began recruiting initiates from the local populace.
The Brotherhood once ruled with an iron fist over eastern Colorado, Missouri, Kansas, Illinois, and southern Iowa, protecting the people from raider and mutant threat alike, but at the cost of high "taxes" in the form of supplies and personel.
Now, after a brutal war with Caesar's Legion, the Brotherhood has retreated, leaving Kansas and Colorado at the mercy of Legion, and they have lost control over their original headquarters in Illinois. The Brotherhood's current commander, Willow Harkanin, taking over after her father was killed in the war, is trying to recoup her losses and restablish order over the region by any means necessary.