Mohammad Reza Mahdavi Kani ( Persian : محمدرضا مهدوی کنی , 6 August 1931 – 21 October 2014) was an Iranian Shia cleric , writer and conservative and principlist politician who was Prime Minister of Iran from 2 September until 29 October 1981. Before that, he was Minister of Interior in the cabinets of Mohammad-Ali Rajai and Mohammad-Javad Bahonar . He was the leader of Combatant Clergy Association and Chairman of the Assembly of Experts and also founder and president of Imam Sadiq University .