The Committee of Union and Progress (CUP) (), later the Union and Progress Party (), was a secret revolutionary organization and political party active between 1889 and 1926 in the Ottoman Empire and the Republic of Turkey. The foremost faction within the Young Turk movement, it instigated the 1908 Young Turk Revolution which ended absolute monarchy, and from 1913 to 1918 it ruled the empire as a one-party state. The CUP conducted the Armenian Genocide and other ethnic cleansing campaigns during one party rule. The CUP was frequently conflated with the wider Young Turk movement and its members were referred to as Young Turks, even though rival groups within the movement formed separate political parties. Within the Ottoman Empire its members were known as ('unionists') or ('committeemen').