The Dersim rebellion (Dersim İsyanı, Serhildana Dêrsimê) was a Kurdish uprising against the central government in the Dersim region of eastern Turkey, which includes parts of Tunceli Province, Elazığ Province, and Bingöl Province. The rebellion was led by Seyid Riza, a chieftain of the Abasan tribe. In 1937 and 1938, the Turkish Armed Forces carried out three Dersim operations against the rebellion, including the Dersim massacre (Tertelê), (sometimes called the Dersim genocide) of civilians: thousands of Kurds were killed and many others were internally displaced. On 23 November 2011, Turkish prime minister Recep Tayyip Erdoğan gave an apology for the Dersim massacre, describing it as "one of the most tragic events of our near history" adding that, whilst some sought to justify it as a legitimate response to events on the ground, it was in reality "an operation which was planned step by step". However, this is viewed with suspicion by some, "who see it as an opportunistic move against the main opposition party, the secular CHP." Kurdish tribes, which were feudal (manorial) communities led by chieftains (agha) during the Ottoman period, enjoyed a certain degree of freedom within the boundaries of the manors owned by the aghas. Local authority in these small manorial communities was in the hands of feudal lords, tribal chieftains and other dignitaries, who owned the land and ruled over the serfs who lived and worked on their estates. However, the general political authority in the provinces, such as Dersim, was in the hands of the Ottoman government. Following the establishment of the Republic of Turkey in 1923, some Kurdish tribes became unhappy about certain aspects of Atatürk's "Kemalist policies", described as "the ideology of the new political élite tied to the single-party régime", imposing a policy of Turkification, including the removal of functionaries of "Kurdish race" in Turkish Kurdistan and land reform, and staged armed revolts that were put down by the Turkish military.