This undated photo released by the San Patricio church, shows Father Alfredo Leaden in Buenos Aires, Argentina. In what became known as the San Patricio Massacre, gunmen believed to be from a military unit stormed into the church after midnight on July 4, 1976, and shot to death three priests including Leaden and two seminarians - the bloodiest single act of violence against the Roman Catholic Church during Argentina's brutal dictatorship. Now Catholic officials in Argentina are working to have them declared saints. And the man who promoted their cause as archbishop has become Pope Francis. (AP Photo/San Patricio Church)