Mr. Trump's words are not simply bluster; his Attorney General Jeff Sessions is intent on turning them into policy. Mr. Sessions has scorned the Obama administration's efforts to review police misconduct and to forge consent agreements on reforms with police departments from Chicago to Baltimore. He spreads the myth that reform handicaps law enforcement. In a nation that locks up more of its people than any in the world, he's instructed U.S. attorneys to seek the harshest penalties available for those found guilty of violating the law.