There is a new tool made possible by the transparency presindency from the FBI that they are calling humorously enough THE VAULT, ok I added the capitalization. I have been having just the best time exploring the documents that they have placed in a very easily searchable PDF format.
Link to THE VAULT
Let me give you a couple of examples of the fun.
Hoover's assistant is sent out to Roswell and writes back the aliens are real.
Lots of people saw Hitler alive after WWII
Got a file on Greenpeace
Here's Malcolm X's file
There is literally tons of information in this new website and files on people from Carl Sagan to Tupac Shakur. Tour THE VAULT and let me know in comments if anything was interesting to you.