After elections in 1957, Milton Margai bowed to behind-the-scenes pressure and stepped down from SLPP leadership, replaced by his brother Albert Margai. However, in 1958, Albert Margai and Siaka Stevens launched a new party, the People’s National Party (PNP), which aimed for greater African involvement in the British colonial government. With the independence of Ghana in 1957, the PNP sought the support of the educated elite to lead a transition to independence. Stevens would later leave the party to form the northern-supported All Peoples Congress. Upon independence in 1961, Milton Margai became Prime Minister, and the SLPP became the ruling party. The SLPP, along with almost all Sierra Leonean political parties, signed the constitution at the London constitutional conference; the APC was the notable exception. This unity did not extend to national politics, as opposing politicians often faced detainment under SLPP rule.
Sir Milton Margai‘s death in 1964 left SLPP leadership to his brother Sir Albert Margai. Albert’s rule was characterized by dissent. Politically, he attempted to strengthen the position of SLPP elites relative to the chiefs, who had formed the backbone of the party. Albert’s autocratic leadership style was questioned within his party, sparked by actions such as the demotion of senior party members Alhaji M.S. Mustapha and Kerefa Smart. Albert also embarked on a policy of Africanisation, which removed some civil servants who favored a colonialistic approach. Scores of schools were built in the provinces along with Teachers Colleges in every district (Makeni, Magbruka, Moyamba, and the Milton Margai Teachers College).
Opposing leaders criticized Margai’s presentation of a bill to establish a one-party system in Sierra Leone and also blamed Margai for developments had led to an economic slowdown. In the 1967 elections, the APC and SLPP each won 32 seats in parliament, with 2 former SLPP Independents siding with the APC MPs Kutubu Kai-Samba and Luseni A. M Brewah. This development confirmed that the SLPP would no longer lead the country.
The subsequent political unrest led to the declaration of martial law and a military coup that took full control of the national government. The National Reformation Council (NRC), led by Major Charles Blake, was established on 23 March 1967. Pressure from political elites, trade unions, and university students led to the junta’s collapse in November 1970, and Siaka Stevens of the APC became president after the interregnum.
Under Stevens, Sierra Leone became a one-party state. In 1978 all SLPP MPs except one (Manna Kpaka, MP in Kenema) joined the APC. The SLPP was outlawed, and its elites and supporters were physically threatened and barred from holding meetings..
