Here is Arthur Miller writing an apologia of Castro in The Nation. Andrew Sullivan has a wonderful paragraph on it and its meaning, and I quote it in full:

"When you read a piece like this one by Arthur Miller, you realize that for a certain generation, there’s no chance that they will ever get their heads around the horrors of communism. Here’s Miller, dining with a murderer, thug and dictator, and finding some elegant way to remain committed to liberal principles. He can relay Castro’s obvious megalomania; he can see his monstrous narcissism; but he still hangs in there, blaming the embargo for almost everything, mainly concerned that he’s being kept up past his bedtime. He still longs for a world in which Castro might have succeeded, a world which cannot exist, and which never existed - except in the minds of aging Nation-readers. There is, I think, no chance of persuading this generation. They are lost. But eventually they will die off, and a new realism can take hold. Tick-tock."