Answer:
1- Leader of Iran before the Iranian Revolution --- Shah Mohammed Reza Pahlavi
2- Nationalist prime minister of Iran --- Mohammed Mossadegh
3- Leader of the Islamic Republic after the Revolution --- Ayatollah Khomeini
Step-by-step explanation:
1- Mohammad Reza Pahlavi was shah of Iran from September 16, 1941 until the Islamic Revolution of February 11, 1979. He was the second and last monarch of the Pahlavi dynasty and the last Iranian shah.
2- Mohammad Mosaddeq was a democratically elected prime minister in Iran that ruled between 1951 and 1953.
On March 20, 1951, he nationalized oil. After blocking Iran and exerting other pressures, the United States and the United Kingdom financed a coup organized by the CIA and encouraged by MI6 in 1953, which overthrew Mosaddeq and established a monarchical dictatorship headed by Sha Mohammad Reza Pahlavi.
3- Ruhollah Musavi Khomeini was an Iranian ayatollah, political-spiritual leader of the Islamic Revolution of 1979, which overthrew the Shah Mohammad Reza Pahlevi, and Supreme Leader of the country until his death. Western powers considered him a fanatical leader, whose political initiatives jeopardized international stability. He is considered the founder of the Islamic Republic of Iran.