In 1951, Mohsen Pezeshkpour and Dariush Forouhar came to a disagreement as to how the party should operate, and a division occurred. The Pezeskpour faction, which retained the party name, believed in working within the system of Mohammad Reza Pahlavi. The Forouhar faction, which adopted a new name, Mellat Iran ("Nation of Iran Party"), believed in working against the system. Mellat Iran was far more fervently nationalist than the former party, and strongly supported and was allied with the national movement of Mohammad Mossadegh, who had founded the National Front of Iran ("Jebhe Melli") with other Iranian nationalist leaders.