NASHVILLE, Tenn. - -Demetrius Duncan a/k/a Whirley, 32, Alto Parnell a/k/a Al-Pistol, 31, and Chris Young a/k/a Soldier C, 25, all of Clarksville, Tennessee, were convicted Friday in U.S. District Court, of operating a drug conspiracy and related firearms charges, after a three week jury trial, announced David Rivera, Acting...