A federal judge on Thursday blocked the Chicago police union from intervening in the consent decree negotiations between the city government and the Illinois Attorney General’s Office.U.S. District Judge Robert M. Dow Jr., found that the Fraternal Order of Police, Lodge No. 7, waited too long to file suit to formally join the negotiations between the city and state.To give the union a seat at the table at this point in the process would be prejudicial to the two governmental entities who have spent “countless …