Deputy Police Commissioner Peter McKenna says officers were legally unable to stop a neo-Nazi rally. (Mark Evans/AAP PHOTOS)Deputy Police Commissioner Peter McKenna says officers were legally unable to stop a neo-Nazi rally. (Mark Evans/AAP PHOTOS) Credit: AAPAuthorities could not have halted a neo-Nazi rally outside a state parliament, a top police officer has suggested while citing internal advice. Deputy NSW Police Commissioner Peter McKenna gave evidence on the protest as he faced the Royal Commission into Anti-Semitism and Social Cohesion on Tuesday. The application, lodged nearly two weeks prior to the rally, detailed White Australia Party's intentions in explicit terms.