A statewide manhunt is under way for five alleged members of the Aryan Brotherhood of Texas, men considered to be extremely dangerous.
One of them is believed to be in the area. Federal investigators say Glen Millican is in Houston.
Brian Thomas in San Antonio and three others could be in the Dallas-Fort Worth area.
Twenty-nine other alleged members, named in a federal indictment, are already in custody.
"Brutal beatings, fire bombing, drug trafficking and murder, are all part of ABT's standard operation procedures," US Assistant Attorney General Lanny Breuer said.
Ten defendants have been charged with offenses that are eligible for the death penalty. The remaining 24 defendants face a maximum penalty of life in prison.