Brian Latell’s book: “Castro’s Secrets - Cuban Intelligence, The CIA, and the Assassination of John F. Kennedy” tells many details about the workings of the Cuban DIG and the events surrounding the assassination that I hadn’t seen before. He spells out a believable theory that has Castro knowing about LHO’s intentions to shoot JFK before it happened but remaining silent instead of warning the U.S. about it. An interesting book that, in my opinion, just might be true!
As you point out, Latell doesn't believe Oswald acted on behalf of Castro or on his orders but that Castro may have known that something was going to happen in Dallas because Oswald had made threats against JFK at the Cuban consulate. But that's a pretty far reach; how would Castro even know Oswald was in Dallas that day? There's no evidence of any communications between him and Cuban officials. Where's the evidence for this connection?
In any case, we do have that interesting "exchange" of threats between JFK and Castro. Castro made his on September 27, 1963 at the Brazilian Embassy in Havana. There he told an AP reporter, Dan Harker, that assassination plots against him might backfire and "[the plotters] will not themselves be safe." Harker later explained that Castro specifically singled him out for the remarks and that it was clear that Castro's threat was against US leaders.
Harker: "I never misunderstood Castro. There was absolutely no hint that he was referring to the Cuban exiles. Spanish is my first language, as a Latin-American born in Columbia, Venezuela. That's why the AP sent me to Havana in the first place, because I was fluent in both Spanish and English.
Castro chose me for the interview because I had interviewed him two months earlier, and he was impressed with the4 accuracy of my account. After the September conversation, I stayed in Havana three more years and never once
did he complain that I had misrepresented him. In fact, all our wire transmissions were monitored by the Castro government, which had to approve the material before it was sent out.
The interview [with Castro] lasted three hours. We stood the entire time. Castro was not mad, merely colloquial."
And when Castro was asked about the above comment by the HSCA he said that his warning had nothing to do with the
exiles, but with it was a "warning that we know" about the plots, and they just might boomerang on the authors of the plots."
Then four days before the assassination JFK said this: "It is important to restate what now divides Cuba from my country and from all of the American countries. It is the fact that a small band of conspirators has stripped the Cuban people of their freedom and handed over the independence and sovereignty of the Cuban nation to forces beyond the hemisphere.
They have made Cuba a victim of foreign imperialism, an instrument of the policy of others, a weapon in an effort dictated by external powers to subver the other American Republics. This, and this alone, divides us. As long as this is true nothing is possible. Without it everything is possible. Once this barrier is removed, we will be ready and anxious to work with the Cuban people in pursuit of those progressive goals which, a few short years ago, stirred their hearts..."
So we do have as a backdrop these interesting tit-for-tat implicit threats by Castro and JFK against each other. Did Oswald read these? Was he aware of them? I think so. But did they motivate him to act in response?