You know that information like that is usually not declassified for 75 years after it happens. Mostly so any involved would be dead and whatever happened would be less on peoples minds by that point.
That's not entirely true, the Freedom Of Information Act has been used on many highly classified documents in the U.S Government's possession that are only 50 years old. That may seem like a while, but it's enough to the see the behavior of some critical departments in the U.S.
There is a book called "Legacy of Ashes" about the actions of the CIA after their formation in the late 40's and on into the 50's. Other then being largely incompetent, they also staged numerous actions against states and people that they believed were threats to their existence. They then lied about these actions to congress and the President. This made them an autonomous agency following their own agenda (which in some cases was not very American). None of this is speculation, you can read their own reports by their own operators and officers to verify this.
What is important to note is that the President is often one of the last people to know what's going on. There may be many agencies in the U.S. Government that call their own shots, and don't give a damn about the President, Congress nor the American People. Eventually I feel one of them may "make a move" on the U.S Government, all it takes is a crisis situation.
After every storm it's always the scum that floats to the top.
.