“After Grigory Rodchenkov left his position as the director of a Russian anti-doping lab, in November of 2015, some burly guards showed up in his front yard. Ostensibly, they were sent to protect Rodchenkov from prying reporters. But he knew enough about Vladimir Putin’s Russia to fear the worst. “One day, he is security,” Rodchenkov said last week. “Next day, he is killer.”