The effort to document war crimes in Ukraine has gotten strong international support. But what does it actually take to put a former leader on trial at The Hague? For an example, we look at the violence that enveloped Yugoslavia in the 1990s, and the trial of Serbian leader Slobodan Milosevic. The World’s Chris Harland-Dunaway tells the story of two men: the prosecutor — Alex Whiting, and Milan Babic, and insider who turned on Milosevic.