Reply #43: I think the point of the Blakey quote in the PBS interview addendum...

[AntiFascist]

was that investigators were steered clear of the fact that the CIA was working with mafia hitmen and putting them on the payroll, as it were. The essential question should be, who paid for the JFK hit, and I wouldn't be surprised if the answer might be found within the nexus surrounding Nixon, his ties to the mob, and (CIA-related) Latin American business interests. Cuban casinos, the sugar industry, and certain Texas oil men were likely all part of this, part of which is evidenced in the Nixon tapes that have been released.

On Edit: Also, Nixon may have been running his own shadow government. He narrowly lost the presidency to Kennedy in 1960, but was planning a Cuban invasion at the time. The CIA continued with its plans for the Bay of Pigs, and only let Kennedy know about it at the last minute.