Assassination in the struggle for power in Cuba

Reader Photon asks:

Assassination was not his tactic.

"So 'LBJ and crew' murdered John Kennedy, but Fidel 'most certainly was not [involved]'? While I consider it unlikely that Oswald could have cooperated with anybody in a conspiracy, his visit to the Cuban Embassy certainly is intriguing. It is not like Fidel had never sanctioned political assassination…