[1] During the Pahlavi dynasty, the party was represented in the Parliament[9] and considered a semi-opposition within the regime, allowed to operate until officially denouncing Iran's assent to Bahraini independence in 1971.

[15] The Pan-Iranist Party spoke supportive of the Iranian Green Movement in 2009[16] and its discourse was revived in the 2010s by the conservatives who tactically adopted its positions amidst Iran–Saudi disagreements and clash.

[17] The invasion of Iran by Anglo-Soviet armies in the early 20th century led to insecurity among Iranians who saw the king, Reza Shah, powerless against such foreign presence in the country.

Though the pan-Iranist movement had been active throughout the 1930s, it had been a loosely organized grass roots alliance of nationalist writers, teachers, students, and activists.

[19] After the British-American sponsored coup d'etat against Mossadegh, the Shah assumed dictatorial powers and outlawed almost all political groups, including Mellat Iran and the National Front.

Beginning in the late 1960s, under the government of Amir Abbas Hoveyda, Iran mostly became a one-party dictatorship under the Imperial Resurrection Party (Rastakhiz).

Nationalist movements such as Mellat Iran and the National Front, which had been opposed to the Shah, remained in the country and played a crucial role in the revolutionary provisional government of Mehdi Bazargan.

After the Islamic Revolution of 1979, which eventually saw the rise to power of Khomeini to the position of Supreme Leader after the collapse of the provisional government, all nationalist groups, as well as socialist and communist movements such as the Tudeh Party, were banned.

In the early 1990s, Pezeshkpour wrote a letter of apology to the new Supreme Leader, Ali Khamenei, stating that he wished to return to Iran and promised to stay out of politics for good.

In the summer of 2004, an attempt by a motorist, allegedly an undercover operative of the Ministry of Intelligence, on the life of Mohsen Pezeshkpour failed in front of his residence in Tehran.

During January, 2011, co-founder of the Pan Iranist Party, Mohsen Pezeshkpour was announced dead when under house arrest by the Iranian Government.

Reza Kermani died on January 30, 2013, due to health issues brought upon him by the 18 months imprisonment within Gohardasht Prison, where many have deemed conditions inhumane and criticized internationally.