The Aryan Brotherhood of Texas (ABT) is a prison gang known for its overtly racist and white nationalist philosophy. Despite similarities in their name and organizational structure, the ABT is no more connected to the Aryan Brotherhood than they are to other neo-Nazi groups throughout the country.
According to the FBI, the ABT trace its origins back to California in 1967, before migrating to Texas’ prison system in 1984. The original purpose had supposedly been “providing protection for whites serving time in prison,” with members of the ABT apparently feeling this was a necessary response to the growing number of African Americans who were imprisoned as a result of racial disparity in law enforcement.
https://www.muckrock.com/news/archives/2017/apr/03/fbi-aryan-brotherhood-texas/