Attorney General William Barr is bringing increasing clarity to the focus of U.S. Attorney John Durham’s criminal investigation into the conduct of the Russia collusion investigators. In a series of recent interviews, the nation’s chief enforcement officer has dropped some big hints about what is under investigation, who is and isn’t being investigated, and what evidence uncovered by the Durham team is emerging as important. Barr also has suggested what events in the timeline are emerging as important in the 2016-17 effort to find dirt on President Trump and his campaign and transition team. Here are the seven most important...