The National Liberation Front (NLF) was a Marxist paramilitary organization and a political party operating in the Federation of South Arabia, (now southern Yemen) during the Aden Emergency. During the North Yemen Civil War, fighting spilled over into South Yemen as the British attempted to establish an autonomous colony known as the Federation of South Arabia. Following the exit of the British armed forces, the NLF seized power from its rival, the Arab nationalist Front for the Liberation of Occupied South Yemen (FLOSY). In the aftermath of the Emergency, the NLF reorganized itself into the Yemeni Socialist Party and established a single-party Marxist-Leninist government, known as the People's Democratic Republic of Yemen.