Russia's online community has been abuzz over the past week with praise for popular YouTuber Yury Dud's documentary about life in the land of the gulag labor camps. His documentary, “Kolyma — Birthplace of Our Fear,” was viewed 9.5 million times in seven days. It’s a departure for the 32-year-old sports editor, whose 5.1 million subscribers tune in to watch him interview personalities from all walks of life about their personal lives. “Why is it that — after rappers, comedians, musicians, actors and directors — we approached this difficult and alarming subject?” Dud asks at the top of the show....