information pulled from the shroud of government secrecy has fed conspiracy theorists who believe oswald did not act alone and may have been backed by cuba, russia, the mafia and karma. i saw a flash of light in the bushes. and then shots rang out. reporter: and these latest papers are fascinating serious historians, too. even when they 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 precisely what intelligence agents are cagey about. they don t want their methods or their contacts known, even decades later after this far-ranging investigation. and that s why about 10,000 documents remain either heavily redacted or entirely off limits.
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
america to send materials of political warfare. you can see that in the documents. is there anything juicy? is there any juicy nugget? is there any juice, tim, where s the juice? about the kennedy assassination that we won t have known previously. so far, but i ve only looked at 20% of it. let me tell you, so far there s some really good juice about assassination plots about other people. i learned more details about how the mafia were used in an attempt to kill castro. i 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. was it an exploding cigar? oh, my goodness. no, it was actually pills. we knew there were pills, but how the pills were actually sent to cuba, who it was who had the pills in cuba. why it was the mafia was involved, and what role a mafia run casino in havana played in