Even if the Bar takes the licence away that is nothing compared to the damage they caused. Maybe a more fitting punishment would be to go to jail for the same amount of time than the wrongfully convicted plus paying said person a salary for all those years. Of course if it can be proved that he withheld exculpatory evidence on purpose. (and the same should go for all accomplices) (and of course there is the issue of the crimes committed by the real culprit afterwards)