PSIT was founded on 21 September 1950[1] at a General Assembly, with André Labrouquère, a French socialist leader and freemason, playing a major role in its establishment.
Koulamallah had been the treasurer of the Democratic Union of Chad (UDT), but been expelled for financial mismanagement.
[2] The party contested the 1951 elections to the French National Assembly with Koulamallah and Aganaye as its candidates.[3].
A group of expelled PSIT leaders, led by Ahmed Kotoko, formed a new Independent Socialist Party of Chad.
[6] In 1956 Koulamallah founded a section of the African Socialist Movement, replacing his PSIT.