Retrial began Tuesday in federal court in Newark in the case of Paul Bergrin, a former prosecutor accused of running a crime ring through his law office that carried out witness murder, drug trafficking and other crimes.

U.S. District Judge Dennis Cavanaugh heard a total of four hours of opening arguments by the prosecution and by Bergrin, who is conducting his own defense, just as he did in the 2011 proceeding that ended in a mistrial.