ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up for ProPublica’s Big Story newsletter to receive stories like this one in your inbox as soon as they are published. The U.S. Anti-Doping Agency’s investigation of Alberto Salazar, the most prominent track coach in the world, backed by Nike, the most powerful company in track, took so long that many wondered publicly if it had died out with a closed-door whimper. But Monday night, more than four years after the agency launched its investigation of medical misconduct and rules violations within Salazar’s prestigious Nike Oregon Project, an arbitration panel delivered perhaps the most resounding blow in track: It ruled that the renowned coach had violated anti-doping rules and will be banned from the sport for four years. The news came as Salazar’s athletes are dominating running’s premier events. Two have set world records this year; others have already won gold at this week’s World Championships or are set to race Tuesday night or later in the week; still others will vie for the win in the Chicago Marathon in two weeks. Effective immediately, Salazar can no longer coach those athletes — or any pro runne...