warren report, every tiny bit of information pulled from the shroud of government con spearsists who believe oswald did not act alone and may be backed by russia and the mafia. i saw a flash of light in the bushes and then shots rang out. reporter: and these latest papers are fascinating serious historians even when they are aren t all about oswald. i learned some things today, more details about how the mafia were used in an attempt to kill castro. now i sort of understand much better the technique that would have been involved and why it was a serious effort, which did not actually succeed as we know. reporter: that sort of information is what has driven a lot of the secrecyarn the kennedy files as they have wanted to keep under wraps their methods and contacts used in the far-ranging investigation even d