I'll add one more recommendation. If you read these, you'll have to devote some serious time to it. And maybe read them more than once to really get it. And you gotta read them in order for it all to make sense.
These novels are often referred to as James Ellroy's "American Crime Trilogy" because it consists of three books...American Tabloid, The Cold Six Thousand, and Blood's a Rover.
I won't give away plots, but briefly:
American Tabloid details the forces behind the election of JFK and the plot that was conceived to assassinate him. The plot is remarkably believable and a lot of the characters in the book are real...JFK, Lee Oswald, Guy Bannister, Jimmy Hoffa, Bobby Kennedy, and on and on. Details of the Bay of Pigs sound as if they could have been lifted from government files.
The Cold Six Thousand gets into the post-JFK years and on into Vietnam and the CIA's role in drug smuggling. Again, lots of the characters are real people...Jack Ruby, J. D. Tippit, Allan Dulles, LBJ, etc., etc. This book picks up immediately after JFK's murder and the cover up surrounding it. J. Edgar Hoover is featured heavily in this book, and the book's portrayal of him is actually backed up in real life by historical documents and personal recollections of the man. It is not a flattering picture of him.
Blood's a Rover (in a nutshell) follows J. Edgar Hoover's mental unraveling and branches off into the anti-communist/anti-labor movements. I admit this was the hardest of the books for me to follow for some reason, so I can't really give a good synopsis of it. Might be because the Cold War and its events doesn't interest me all that much, I don't know. I can quote parts of the first two novels verbatim, but I can't do that with Blood's a Rover.
A warning here. If lots of profanity, extreme and graphic violence (think of Pacino's Scarface on speed and coke), strange sex, and reprehensible characters are a turn off for you, then disregard this recommendation. Really, just forget it.
These books are so strongly written, they make what we normally think of as hardboiled noir fiction (Chandler and Hammett for example) look like soft scrambled eggs.