Communist states share similar institutions which are organised on the premise that the communist party is a vanguard of the proletariat and represents the long-term interests of the people. The doctrine of democratic centralism, developed by Vladimir Lenin as a set of principles to be used in the internal affairs of the communist party, is extended to society at large. According to democratic centralism, all leaders must be elected by the people and all proposals must be debated openly, but once a decision has been reached all people have a duty to account to that decision. When used within a political party, democratic centralism is meant to prevent factionalism and splits. When applied to an entire state, democratic centralism creates a one-party system. The constitutions of most communist states describe their political system as a form of democracy. They recognize the sovereignty of the people as embodied in a series of representative parliamentary institutions. Such states do not have a separation of powers and instead have one national legislative body (such as the Supreme Soviet in the Soviet Union) which is considered the highest organ of state power and which is legally superior to the executive and judicial branches of government.