Several institutions such as the house of the prime minister, Ministry of Peace, headquarters of the Ethiopian National Defense Force and federal police, as well as national intelligence agencies INSA and the NISS, are located in the city. In addition, it is the seat of Jubilee Palace, African Union and the predecessor Organisation of African Unity (OAU). It also hosts the headquarters of the United Nations Economic Commission for Africa (ECA), as well as various other continental and international organizations. Addis Ababa is therefore often referred to as "the political capital of Africa" for its historical, diplomatic, and political significance for the continent.