BLUEFIELD, W.Va. -- A federal prosecutor says a crackdown on the illegal distribution of prescription drugs in Southern West Virginia has resulted in five more convictions.U.S. Attorney Booth Goodwin says four Mercer County residents and a Baltimore man pleaded guilty Monday. Launched in June 2011, the Bluefield Pill Initiative targets prescription drug trafficking in Mercer, McDowell and Wyoming counties.The four Mercer residents pleaded guilty to distributing hydromorphone, a prescription painkiller commonly known as Dilaudid. They are 43-year-old Robin Bolton, 39-year-old Alane McKenzie, 39-year-old Robin Roope, and 43-year-old Earl Inscore. Thirty-one-year-old Robert J. Fleek Jr. of Baltimore pleaded guilty to distributing hydromorphone and buprenorphine, which is also known as Suboxone or Subutex and is intended to help people overcome opioid addiction.