Among the most vocal critics of the Koi Nation’s project is Greg Sarris, chairman of Graton Rancheria, a federation of Coast Miwok and Southern Pomo people with more than 1,500 members. The tribe’s …Among the most vocal critics of the Koi Nation’s project is Greg Sarris, chairman of Graton Rancheria, a federation of Coast Miwok and Southern Pomo people with more than 1,500 members. The tribe’s …