The effort to document war crimes in Ukraine has gotten strong international support and the International Criminal Court is currently on the ground investigating. But what does it actually take to put a former leader on trial at The Hague? Before the International Criminal Court existed, there was the International Criminal Tribunal for the former Yugoslavia. The marquee case was the trial of Serbian leader Slobodan Milosevic, the so-called “Butcher of the Balkans.” The World’s Chris Harland-Dunaway tells the story of two men from the court: a prosecutor and an insider who flipped on Milosevic.