On 24 September 1960, an outspoken critic of the SLPP government, Siaka Stevens, joined the alliance with several northern politicians including Alhaji Chief MucktarruKallay Alhaji Gibrill Sesay Sorie Ibrahim Koroma, Christian Alusine-Kamara Taylor, Mohammed Bash-Taqui, S.A.T.
Stevens took advantage of the dissatisfaction with the ruling SLPP among some prominent politicians from the Northern part of Sierra Leone to form the APC.
Stevens used the Northern part of Sierra Leone as his political base.
Sierra Leone and the United Kingdom signed a secret defence pact.
[1] Upon their return to Freetown on 4 May 1960, Stevens was expelled from the People's National Party (PNP).