We may not ever know the whole story about Oswald (or many other things re:JFK) - maybe a 100 years from now all the govt docs will be open books. Maybe not.
No doubt Fidel Castro was involved...along with a few US govt agencies and individuals/politicians.
CIA, FIB, LBJ...just to name a few
The only way we’ll ever know is if Trump is allowed to serve his second term. He might be able to break the strangle hold on power that the DS and IC have here in America. We will never get another opportunity. Whatever their involvement was, the CIA could have prevented the assignation. After seeing what they’re capable of, the odds are it was a CIA sanctioned hit. If Trump stops the steal I doubt he survives long.
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One aspect of the Oswald case that has always intriqued me.
The uncle of his wife Maria, was a high ranking official in some branch of Soviet intelligence. It was very unusual for close relatives of those officials to be allowed to travel outside the USSR during the height of the cold war.
Showed what one motivated Marine and his rifle can do.