Will there be any changes on Beacon Hill, now that a federal jury has determined that the usual way of doing things in Massachusetts amounts to racketeering and mail fraud.Former Probation Chief John J. O’Brien and his deputies Elizabeth Tavares and William Burke III were convicted on the charges. Formally, all three were found guilty of racketeering conspiracy, while O’Brien and Tavares were also found guilty of mail fraud and racketeering.