Since the Islamic Revolution in 1979 Iran has employed a deliberate and successful strategy centered around the use and support of various proxies, notably Hezbollah and Hamas who are part of the Iranian led Axis of Resistance. There is a vast literature that has studied different aspects of this Iranian proxy dimension, but relatively little research has been conducted on propaganda as a unifying mechanism. This thesis thus expanded upon the current literature through a content analysis of the propaganda produced by Iran, Hezbollah, and Hamas in order to gain a fuller understanding of how cross-group cohesion has been achieved. The analysis incorporated social identity theory, and identified how the propaganda could be used in accordance with three theoretical dimensions: Identity constructions, Justification for Violence, and Weaponization of the ummah. The findings revealed how cross-group cohesion was achieved through the creation of a dichotomous worldview, consisting of an ingroup that is existentially threatened by an outgroup consisting of the West and Jews. Moreover, they use conspiratorial rhetoric combined with victimhood in order to frame the struggle as an ongoing religious war against Islam. The thesis concludes with a theoretical discussion on the normative assumptions that underpin the propaganda, arguing that the cross-group cohesion is dependent on the creation of shared identities based on victimhood, religious references, and the creation of shared external enemies.