A class action lawsuit filed Tuesday in Fulton County Superior Court alleges King America Finishing, a textiles plant in Screven County, is responsible for a massive fish kill that left more than 33,000 fish rotting on the Ogeechee River banks last month. It also alleges chemicals discharged by the plant caused illness in some who swam in the river following the discharge. As of Tuesday, Marietta attorney Edwin Hallman Jr. listed three plaintiffs in the suit.