U.S. federal authorities have arrested dozens of members of several white supremacist prison gangs in Texas on charges of drug trafficking and kidnapping. Authorities announced Monday that 57 people were charged in the conspiracies. Forty-two were arrested last week, nine were already in custody on unrelated charges, and six others are being sought. The defendants are linked to several violent and racist prison gangs, including the Aryan Circle, the Aryan Brotherhood of Texas, the Peckerwoods, the Soldiers of Aryan Culture, and the Dirty White Boys, the 55-count indictment said.