[2]: 401 Espousing socialist policies, the party took a strongly critical line towards the ruling monarchy, and consequently faced severe police repression, led by interior minister general Mohamed Oufkir.
The UNFP had a diverse leadership: while Abderrahim Bouabid, and Abderrahmane Youssoufi were considered moderates, Fqih Basri was promoting armed struggle, and Ben Barka chose to oppose the rule from exile.
He later "disappeared" in exile in France, possibly on Oufkir's orders, in a case that remains a powerful if hotly debated symbol of the democratic struggle in Morocco.
Abderrahmane Youssoufi, one of the founders of the UNFP, and later the chairman of the USFP, who was once a political prisoner and condemned to death, in 1998 became head of government through elections.
This — one of the first cases in modern Arab history of a head of government being selected from among the opposition — was viewed as a major breakthrough for Morocco's reform process.