Supreme Leader who is elected by the Assembly of Experts for life (unless the Assembly of Experts decides to remove him, which has never happened). The power of the Supreme Leader under Iran's constitution is almost unlimited and unrestricted in practice. This combined with the view that he is the representative of God held by some religious groups, being the head of the security and armed forces, and controlling the official state media (the radio and television are restricted to state radio and television) makes him immune from any kind of criticism and unchallengeable. Critics of the system or the Supreme Leader are punished severely. Critical newspapers and political parties are closed, social and political activists like writers, journalists, human right activists, university students, union leaders, lawyers, and politicians are jailed for unreasonably long periods for making simple criticism against the Supreme Leader, the Islamic Republic system, Islam and Shia doctrines, the government, and other officials. They have been even threatened by death sentence (though all such verdict in recent years have been dropped in higher courts in recent years) and some have been assassinated by the Ministry of Intelligence and militias in the past (no such case has been reported in recent years). Another main problem is the closed loop in the electoral system, the elected Assembly of Experts elects the Supreme Leader, so in theory he is elected indirectly by popular vote, but in practice the system does not satisfy the criteria for a free election since the Supreme Leader appoints the members of the Guardian Council who in turn vet the candidates for all elections including the elections for Assembly of Experts. This loop limits the possible candidates to those agreeing with the views held by Supreme Leader and he has the final say over all important issues. Also, the fourth unchangeable article of constitution states that all other articles of the constitution and all other laws are void if they violate Islamic rules, and the Guardian Council is given the duty of interpreting the constitution and verifying that all laws passed the parliament are not against Islamic laws. Many articles of constitution about political freedoms and minority rights (e.g. education in mother language for language minorities) have not been applied at all. Other problems include the issues with the rights of racial and religious minorities, influence and involvement of armed forces especially the Islamic Revolutionary Guard