Iran / Persia: Celebrating May Day. Revolutionary poster, Cherik-ha-ye Fadai'e Khalq, c. 1979

Many organizations, parties and guerrilla groups were involved in the Iranian Revolution. Some were part of Ayatollah Khomeini's network and supported the theocratic Islamic Republic movement, while others did not and were suppressed. Some groups were created after the fall of the Pahlavi Dynasty and still survive; others helped overthrow the Shah but no longer exist. Marxist groups were primarily guerrilla groups working to defeat the Pahlavi regime by assassination and armed struggle. They were illegal and heavily suppressed by the SAVAK internal security apparatus. They included the Tudeh Party of Iran; the Organization of Iranian People's Fedai Guerrillas (OIPFG) and the breakaway Iranian People's Fedai Guerrillas (IPFG), two armed organizations; and some minor groups. Although they played an important part in the revolution, they never developed a large base of support.