“First of all, nobody ever goes that way for a visa. Second, it costs money to go that distance. He (Oswald) stormed into the embassy, demanded the visa, and when it was refused to him, headed out saying ‘I’m going to kill Kennedy for this.’…..What is your government doing to catch the other assassins? It took about three people.”
Cuban Prime Minister Fidel Castro, quoted in Warren Commission Document 1359, reporting on a conversation which an informant named “SOLO” had with the Cuban leader in June 1964.
Operation SOLO was the FBI’s penetration of the Communist Party USA via the brothers Jack and Morris Childs.
According to John Newman, Morris was the likely source of CD 1359. Castro is not the only source of the curious story that Oswald threatened Kennedy’s life in the Cuban Embassy.
See Peter Dale Scott’s Deep Politics II, chapter 8.