Hanahoe ("Group of One") was an unofficial private group of military officers in South Korea headed by Chun Doo-hwan, who later became President. The members were mostly graduates of the eleventh class of the Korean Military Academy in 1955. Hanahoe formed the core of the group that eventually took control of the presidency and government from Choe Gyuha, ending the Fourth Republic. After its initial seizure of power on December 12, 1979, this private political organization maintained great influence in South Korean politics throughout the 1980s, but was later disbanded by force when Chun Doo-hwan and Roh Tae-Woo were put on trial in the middle of the 1990s soon after Kim Young-sam became president.