Imposing Shiism as the state and mandatory religion for the whole nation and much forcible conversion of Iranian Sufi Sunnis to Shiism.[44][45][46] He reintroduced the Sadr (Arabic, leader) – an office that was responsible for supervising religious institutions and endowments. With a view to transforming Iran into a Shiite state, the Sadr was also assigned the task of disseminating Twelver doctrine.[47] He destroyed Sunni mosques.