After two Texas prosecutors and one prosecutor's wife were murdered in the last month, the investigation is focusing on members of the Aryan Brotherhood of Texas as possible suspects. Here is a primer on the white supremacist group:

What is the Aryan Brotherhood of Texas?

The  "whites only" group got its start as a prison gang in approximately the 1970's. The group is a separate entity from the Aryan Brotherhood, a California-based gang which denied Texas inmates permission to start a Texas chapter.

Director of California State University's Center for the Study of Hate and Extremism Brian Levin calls the Texas Aryan Brotherhood "one of the most violent domestic extremist groups and crime syndicates in the nation." The group is estimated to have around 2,600 members.

What does the group believe in?

With the motto "God Forgives, Brothers Don't," the Aryan Brotherhood of Texas employs a paramilitary structure. Initially focused on asserting white supremacy and separating races within prison, the group has expanded its activity to drug sales, running prostitution rings and identity theft. The group may have connections to drug cartels.

What relationship does the Aryan Brotherhood of Texas have to the murdered prosecutors?

Before the murders, Texas law officials received a warning that Texas Aryan Brotherhood members were planning to retaliate, due to the indictment of 34 gang members. After verifying that the threat came from a credible source, the Texas Department of Public Safety issued the following bulletin:

"High-ranking members ... are involved in issuing orders to inflict 'mass casualties or death' to law enforcement officials who were involved in cases where Aryan Brotherhood of Texas are facing life sentences or the death penalty."

For a report on "How the Aryan Brotherhood Kills," and an anonymous account of life in the gang, see The Daily Beast.

For a summary of crimes believed to be committed by Aryan Brotherhood of Texas members, see the Southern Poverty Law Center.

For Neon Tommy coverage of the Texas shootings, go here.

Reach Executive Producer Lauren Madow here. Follow her here.