EO 11110
One explanation
http://john-f-kennedy.net/executiveorder11110.htm
The EO
http://www.presidency.ucsb.edu/ws/?pid=59049
There’s no way to know what would have transpired. He was murdered 5 months later.
And as I've pointed out elsewhere, proposing various motives of random people and organizations has nothing to do with actually figuring out who commits a crime. That is something done with evidence. The evidence proves that Oswald did it, and he had no ties to the Fed, or LBJ, or most of the other usual suspects that get offered up.