Chief Counsel of the US House Select Committee on Assassinations, in a 2003 Addendum to a PBS interview:
http://www.pbs.org/wgbh/pages/frontline/shows/oswald/interviews/blakey.html#addendum
I am no longer confident that the Central Intelligence Agency co-operated with the committee. My reasons follow:
The committee focused, among other things, on (1) Oswald, (2) in New Orleans, (3) in the months before he went to Dallas, and, in particular, (4) his attempt to infiltrate an anti-Castro group, the Directorio Revolucionario Estudiantil or DRE.
...
What contemporaneous reporting is or was in the Agency's DRE files? We will never know, for the Agency now says that no reporting is in the existing files. Are we to believe that its files were silent in 1964 or during our investigation?
I don't believe it for a minute. Money was involved; it had to be documented. Period. End of story. The files and the Agency agents connected to the DRE should have been made available to the commission and the committee. That the information in the files and the agents who could have supplemented it were not made available to the commission and the committee amounts to willful obstruction of justice.
...We now know that the Agency withheld from the Warren Commission the CIA-Mafia plots to kill Castro. Had the commission known of the plots, it would have followed a different path in its investigation. The Agency unilaterally deprived the commission of a chance to obtain the full truth, which will now never be known.