A federal judge on Wednesday dismissed racketeering charges against Paul Bergrin, a Newark, N.J., criminal defense lawyer and former federal prosecutor accused of being at the heart of a criminal enterprise that involved murder, bribery and prostitution.

U.S. District Judge William Martini in Newark said federal prosecutors had failed to show that Bergrin and his purported associates had engaged in an ongoing criminal enterprise or had, as a group, participated in a pattern of racketeering activity.