I have long been reporting on Castro-ruled Cuba and, indeed, was there not long after Fidel Castro had taken over the country. What became clear, as the number of Castro’s political prisoners increased, was that his revolutionary Cuba was a dictatorship, like the regime he had ousted. After I wrote that, a member of his administration rebuked me for my rank ignorance. I responded by saying that he knew that if I were a Cuban in Cuba, I would be in prison. Later, at the United Nations, I was one of a number of reporters interviewing Che Guevara, the young,...