Which files are locked up... and why?

I offer this as an op****tunity for both sides of the JFK assassination 
question to debate and speculate on why there are files and information 
relating to the assassination under lock and key. I remember a full page 
ad in what I believe was the NYTimes asking for the TOTAL RELEASE OF ALL 
RECORDS and Professor McAdams signed that request. That aside, speculate 
on why these files are still not available.

Which files are we most in need of that are unavailable? I know some have 
been released but whar are the "top 10 or 20" files we need to see?

Possibilities for not releasing information:

1) Oswald alone shot the President but he had some ties to CIA/FBI 
personnel in some way and this would prove embarrasing.

2) The CIA and Kennedy were at such odds they decided he had to go for a 
number of reasons from the extreme (he was actually a double agent of the 
the communists) to he was just too left and Vietnam offered too many 
op****tunities for strategic containment and potentially cultivation of 
reserves like rubber. So capitalists offed him (see Oliver Stone).

3) Johson did it, they know it (see Barr McClelland's book) and that has 
to be delayed to be released.

4) Oswald did it all by himself, he was a flake, a Communist wannabe but 
the files need to be locked because other sources would be compromised, 
such as agents, networks, etc., many of whom may still be alive.

5) After the Bay of Pigs, a CIA operation, anti Castro Cubans combined 
with the Mob and outlaw elements of the CIA decided JFK's withholding of 
air sup****t was a treasonable offense but instead they shot him and 
somehow this is do***ented in the locked files.

6) Or.... fire away.