Masyumi was the name given to an organization established by the occupying Japanese in 1943 in an attempt to control Islam in Indonesia. Following the Indonesian Declaration of Independence, on 7 November 1945 a new organization called Masyumi was formed. In less than a year it became the largest political party in Indonesia. It included the Islamic organizations such as Nahdlatul Ulama and Muhammadiyah. During the period of liberal democracy era, Masyumi members had seats in the People's Representative Council and the party supplied prime ministers such as Muhammad Natsir and Burhanuddin Harahap.