the U.S. Department of Justice men attacked African-Americans , authorities say . one such assault involved a slingshot , ball bearings , according to prosecutors . Joseph Dominick , Thursday , pleaded guilty 21 to one charge of conspiracy .
Group of Mississippi men attacked African-Americans , authorities say . One such assault involved a slingshot , ball bearings , according to prosecutors . Joseph Dominick , 21 , pleaded guilty Thursday to one charge of conspiracy .