During the last decades the word ”terrorism” has a whole different meaning. Brutality has increased and terrorists of today show no mercy on civilians and innocent people.Fatemiyoun, the Iran-supported brigade (Afghani citizens) have immigrated to Iran to take part in war in a third country, Syria. This type of military activity has created great anxiety in Afghanistan and in the rest of the middle East.In this study the concept ”terrorism”will be used in regard of the Fatemiyoun activities and the implementation of threat and violence in Syria.The issue focused on in this study will be if Fatemiyon can be regarded a terrororganisation or not.I will be using two definitions and two theories. These definitions and theories are applied to actual material concerning the presence of Fatemiyoun in Syria. This is connected to the IRGC and the Iranian government's political concern to expand shiism.There are already some studies on the connection between states and terror groups. The choice to analyze militia groups has favoured the study as Fatemiyoun is a militia group and as a result Fatemiyoun is regarded a terrorist organisation in these theories.Fatemiyoun as a new phenomenon is also a motive for further studies concerning the relation between Iran and its militia groups.