Danny Casolaro
Suicided for what he knew about Iran-Contra, Promis and a few other things. John Bolton pretty much knows all of it too.
Reading about him is what got me into this almost 20 years ago.
This is a good run-down on his investigations:
http:// listverse.com/2017/12/26/10-conspiracies-of-ronald-reagan-iran-and-the-octopus/