During World War II, he joined the al-Husseini to work with Nazi Germany, hoping that Hitler's defeat of France would lead to the liberation of Algeria and other French colonies.

In the summer of 1944, along with five others (Algerians and Germans), Mohammedi was sent by the Abwehr on intelligence and sabotage missions to Algeria, but was arrested in the region of Tebessa and sentenced to death.

During the years 1957, elements of the MNA, supported by the French army, organized military actions against the ALN, eliminating soldiers and officers.

Mohammedi was elected at the Congress of Tripoli to be a member of the Political Bureau, responsible for the Education and Public Health sector.

Deputy of Tizi Ouzou on 20 September 1962, and he was appointed Minister of Former Mujahedin and War Victims in the first government of Ahmed Ben Bella.

In 1967, during the commemoration of the death of Amirouche Aït Hamouda in the village of Tassaft Ouguemoun, he gave a last meeting in which he denounced the autocratic policy of Boumédiène.