The Polisario Front, Frente Polisario, Frelisario or simply Polisario, from the Spanish abbreviation of Frente Popular de Liberación de Saguía el Hamra y Río de Oro (lit. 'Popular Front for the Liberation of Saguia el-Hamra and Río de Oro'; Arabic: الجبهة الشعبية لتحرير الساقية الحمراء ووادي الذهب, romanized: al-Jabhah al-Shaʿbiyah Li-Taḥrīr as-Sāqiyah al-Ḥamrāʾ wa Wādī al-Dhahab), is a rebel Sahrawi nationalist liberation movement claiming Western Sahara. Tracing its origin to a Sahrawi nationalist organization known as the Movement for the Liberation of Saguia el Hamra and Wadi el Dhahab, the Polisario Front was formally constituted in 1973 with the intention of launching an armed struggle against the Spanish occupation which lasted until 1975, when the Spanish decided to allow Mauritania and Morocco to partition and occupy the territory. The Polisario Front waged a war to drive out the two armies. It forced Mauritania to relinquish its claim over Western Sahara in 1979 and continued its military campaign against Morocco until the 1991 ceasefire, pending the holding of a UN-backed referendum which has been consistently postponed ever since. In 2020 the Polisario Front declared the ceasefire over and resumed the armed conflict. The United Nations considers the Polisario Front to be the legitimate representative of the Sahrawi people and maintains that the Sahrawis have a right to self-determination. The Polisario Front is outlawed in the parts of Western Sahara under Moroccan control, and it is illegal to raise its party flag (often called the Sahrawi flag) there. It is a consultative member of the Socialist International.