the Islamic Revolutionary Party (IRP) was Iran's sole political party until its dissolution in 1987; Iran now has a variety of groups engaged in political activity; some are oriented along political lines or based on an identity group; others are more akin to professional political parties seeking members and recommending candidates for office;  some are active participants in the Revolution's political life while others reject the state; political pressure groups conduct most of Iran's political activities; groups that generally support the Islamic Republic include Ansar-e Hizballah, Muslim Students Following the Line of the Imam, Tehran Militant Clergy Association (Ruhaniyat), Islamic Coalition Party (Motalefeh), and Islamic Engineers Society.

mj copyed from  : www.cia.gov/library/publications/the-world-factbook/geos/ir.html