Ayatollah #MuhammadBaqirAlSadr, father-in-law to #MuqtadaAlSadr and a founder of #Shia Islamist group #IslamicDawaParty, along with his sister, teacher #BintAlHuda, were executed after three days of torture on #ThisDayInHistory in 1980 at the order of Iraqi leader #SaddamHussein.