In Utah, federal prosecutors have indicted 21 self-avowed white supremacists on drug and weapons charges. Their arrests came days after 24 alleged white supremacist prison gang members in Kentucky, Mississippi and Texas were indicted on charges of racketeering, illegal firearms trafficking and murder. Separately, the FBI arrested a known white supremacist Thursday and charged him with plotting to firebomb a synagogue in Pueblo, Colorado. The indictments come just weeks after FBI Director Christopher Wray warned Congress that “racially motivated violent extremism” is the primary threat of domestic terrorism in the U.S.