Hitler Brothers

The Hitler Brothers are posthumous antagonists in The Dark Tower series by Stephen King. They appear as flashback villains in Wolves of the Calla. They are two brothers named Nort and Bill Garton based in New York, who kill Black people, Jews, and any supporter of Donald Callahan.

History
The Hitler Brothers lived in New York. They were neo-nazi serial killers. They would kill Black people and Jews, and would carve swastikas into their foreheads.

Agents of the Crimson King hired them to kill Donald Callahan. They tortured his friend, Rowan Magruder, who refused to give him up.

However, they eventually found and captured Callahan. They were going to torture and kill him. However, Calvin Tower and Aaron Deepneau stopped them. The brothers were at some point killed by agents of the Crimson King for failing to kill Callahan.

Roland and Eddie traveled to the past and met Tower and Deepneau. They told them where and how to stop the Hitler Brothers. This creates a circular loop because Roland and Eddie only knew about this because Callahan told them about it in the future.