WASHINGTON, April 14 : The largest U.S. civil rights group on Tuesday sued xAI and a subsidiary, claiming they illegally operated more than two dozen gas turbines in Mississippi to power its Colossus 2 data center, posing a health risk to local residents. The NAACP, represented by Earthjustice and the Southern Environmental Law Center, sued xAI and subsidiary MZX Tech, charging they violated the federal Clean Air Act by running 27 gas-fired turbines before getting necessary air permits for its