I have not seen this production, but I have recently finished a book which details the events surrounding the "massacre", which took place at Kansas City's Union Station railroad depot. The book is called "The Union Station Massacre" by UMKC journalism professor Robert Unger. The book is a fascinating read of how the FBI, which prior to this incident was an unarmed and ineffective detective bureau, transformed into a nation-wide powerhouse of crime fighting. Any history buffs who want to learn more about the events would be well-served by this volume. It isn't generally available in many public libraries, but academic collections will probably have it, and it is usually available by loan.