NEW : Professor says some details of accusations not known . 21 Board of Pardons had yet to receive pardons or had their charges overturned . John Andy Wright , Haywood Patterson and John Andy Wright got posthumous pardons . Alabama dropped rape charges against five of the defendants , and the sixth , Clarence Norris , received a pardon from Gov . Board of Pardons official : `` wrongdoing of social and racial injustice '' is remedied .
NEW : Professor says some details of accusations not known . 21 Board of Pardons had yet to receive pardons or had their charges overturned . John Andy Wright , Haywood Patterson and John Andy Wright got posthumous pardons . Board of Pardons official : `` wrongdoing of social and racial injustice '' is remedied .