Iran experienced a short Third World socialism period at the zenith of the Tudeh Party after the abdication of Reza Shah and his replacement by his son, Mohammad Reza Pahlavi (though the party never rose to power). After failing to reach power, this form of third world socialism was replaced by Mosaddegh's populist, non-aligned Iranian nationalism of the National Front party as the main anti-monarchy force in Iran, reaching power (1949–1953), and it remained with that strength even in opposition (after the overthrow of Mossadegh) until the rise of Islamism and the Iranian Revolution. The Tudehs have moved towards basic socialist communism since then.