 The 1979 Constitution of the Islamic Republic called for the judiciary to be "an independent power," and charges it with "investigating and passing judgement on grievances; ... supervising the proper enforcement of laws; ... uncovering crimes; prosecuting, punishing, and chastising criminals;" taking "suitable measures" to prevent crime and reform criminals.The Head of the Judiciary, also known in English as 'Chief Justice of Iran', is to be a "just Mujtahid" appointed by the Supreme Leader and serve for "a period of five years.