Abstract

The political parties were formed in Iran following western countries, after the constitutional revolution and second parliament in 1909, and since then they have witnessed rise and falls. The analytical study and an accurate knowledge of the main movements forming the political parties of the last century that is essential for the development of a democratic society in Iranian society. Based on an analytical and accurate study, from the very beginning of political party formation to the present, three forces are distinguishable in Iranian Society and the partial activities during the past 100 years can be framed in three movements:
The Religious Movement, the National Movement, and the Left Movement to be the major causes for political party formation in Iran in the last century. In this article, the author has tried to explain these major movements and political parties that emerged from these movements using the library sources.

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