National Democratic Front was founded as an umbrella of various opposition movements in North Yemen on February 2, 1976 in San'a. The five founding organisations of NDF were the Revolutionary Democratic Party of Yemen, Organisation of Revolutionary Resistors of Yemen, the Labour Party, the Popular Vanguard and the People's Democratic Union.[1]
On March 5, 1979, the five founding parties of the NDF merged to form the Yemeni Popular Unity Party. The NDF did however continue to exist as a separate structure. It was joined by Baath Party, led by Qassem Salaam, and the Septembrist Grouping. In 1978 the Baath Party left the front and in 1979 the June 13 Front of Popular Forces joined it.[1]