The Tudeh Party of Iran is an Iranian communist party. Formed in 1941, with Soleiman Mirza Eskandari as its head, it had considerable influence in its early years and played an important role during Mohammad Mosaddegh's campaign to nationalize the Anglo-Persian Oil Company and his term as prime minister. Tudeh became a pro-Soviet organization after the Iran crisis of 1946 and was prepared to carry out the dictates of the Kremlin, even if it meant sacrificing Iranian political independence and sovereignty. The crackdown that followed the 1953 coup against Mosaddegh is said to have "destroyed" the party, although a remnant persisted. The party still exists but has remained much weaker as a result of its banning in Iran and mass arrests by the Islamic Republic in 1982, as well as the executions of political prisoners in 1988. Tudeh identified itself as the historical offshoot of the Communist Party of Persia.

The Iran crisis of 1946, also known as the Azerbaijan Crisis in the Iranian sources, was one of the first crises of the Cold War, sparked by the refusal of Joseph Stalin's Soviet Union to relinquish occupied Iranian territory despite repeated assurances. The end of World War II should have resulted in the end of the Allied joint occupation of Iran. Instead, pro-Soviet Iranians proclaimed the separatist Azerbaijan People's Government and the Kurdish separatist Republic of Mahabad. The United States pressure on the Soviet Union to withdraw is the earliest evidence of success with the new strategy of Truman Doctrine and containment.