First he was indicted on charges of contempt of court after he had refused to answer questions in front of a grand jury regarding the Bananas War. In this case, I think he was sentenced to a short prison term but the sentence was reversed due to his bad health.
That's what puzzles me the most. So many mafia bosses who seemed quite intelligent and whom the police and the FBI were never able to catch for any serious crime did prison time for refusing to answer questions. They could have made something up, the usual "I am a honest businessman, I don't know anything", instead of provoking the judges by refusing to say anything.
