The organization was born as the result of a political union between the leftist Chadian National Union (UNT), led by Ibrahim Abatcha, and the General Union of the Children of Chad (Union Générale des Fils du Tchad or UGFT) which was led by Ahmed Hassan Musa. Musa was close to the Muslim Brotherhood and was an Islamist. The UGFT remained autonomous within the new group under the banner of the Liberation Front of Chad (FLT). The union was agreed at the Nyala Congress, in Sudan, between June 19 and June 22 of 1966. The group's flag was approved at the same congress.