He came to power supported by people who were fed up (in part) with the atrocities combined by Batista the right wing dictator supported by the US. As is usual there is a heavy influence of the US on this site so Castries is generally reviled but he was no different to any number of dictators save that the US did not support him and the US propaganda machine worked against him. He did bad things but so did many others with the implicit or explicit support of the US. Most Americans dislike him due to the 50 years of negative US press not because of specifics actions they could detail.