There are no "common criminals" in Fidel Castro's jails. No prisoner who has ever stood before a Castro "judge" has ever received a fair trial whatever his alleged offense. Even those who "confessed" must be presumed to have done so under duress. All Cuban "courts" are star-chambres and anterooms to the torture chambers.
All "judicial" acts committed by this outlaw de facto regime over the last 48 years are unconstitutional, from the witch trials at the beginning of the Revolution to the latest sentence handed down by a Castro "tribunal."
Everyone in a Cuban jail is a political prisoner.
No need to parse that, though there are many who fall into Castro's trap and actually define political prisoners according to his rules.