Oil Nationalization Day is observed in Iran every March 20, commemorating the nationalization of the oil industry in 1951. This significant event began when the National Iranian Oil Company took control of the petroleum sector, led by Mohammed Mossadegh, a member of the Iranian Parliament who organized the National Front of Iran. The movement faced opposition from the Anglo-Iranian Oil Company, resulting in widespread demonstrations and a two-year struggle that culminated in the passage of a law for oil field nationalization. The adoption of this law sparked conflicts between Iran, the US, and the UK, leading to a boycott of Iranian oil and plans for a coup by the latter two nations. Despite these challenges, the nationalization of oil remains a pivotal moment in Iranian history, celebrated annually on this date.