In Cuba, there is no such thing as a "common prisoner" because due process is not available there to any prisoner and all must therefore be assumed to be innocent, even those labelled "common prisoners" by the regime, until such time as their cases are reviewed, and, if necessary, adjudicated by a de jure state which obeys the Rule of Law. Moreover, it is often the practice of the Castro regime to label as "common criminals" persons whose actions would nowhere else subject them to prosecution or imprisonment.
In a list of Cubans killed "extra-judicially" in 2007 by the regime (that, too, is a misnomer since it supposes the existence of a competent judiciary in Cuba), compiled by the Cuban Archive Project and reproduced in Babalú by rsnlk, one prisoner's death is described thusly:
Manuel Diende Rosa, common prisoner, was reported to have committed suicide by hanging on September 2, 2007 in his punishment cell at the Kilo 7 prison in Camagüey. He was on a hunger strike to demand his rights.
At the very least, Diende Rosa should have been identified as someone "alleged to be a common criminal by Fidel Castro's outlaw regime," or, better yet, his patriotic conduct and martyrdom should not have been sullied by any reference to what his verdugos claimed he was.
Laudable as is the work of the Cuban Archive Project, it should be more careful not to create extraneous distinctions betweens Cuban prisoners or Cubans in general. This is precisely what the regime would want and what they should avoid doing.
Cuba's Political Prisoners: Forgetfulness Is Never Acceptable