Social groups and movements are considered a fundamental socio-political force in all countries that intend to get back on the public demands especially when the authorities are not able or eager to do so. Anti-war groups are among the most pivotal social groups that focus on the establishment of sustainable peace in communities so, since the second half of the twentieth century, their efforts have been regarded as the determinant factor in world politics. This paper aims to study the origins and functions of those American anti-war organizations that oppose US war policies mainly against Iran after the September 11 th Attacks. Archival research and historical analysis of the role of these groups and organizations demonstrate that they came into existence in response to the ever-growing global conflicts and created social campaigns for peace without governmental interventions. Similarly, due to the increasing violence and conflict between Iran and the United States during recent decades, the groups such as A.N.S.W.E.R. Coalition, Code Pink, International Action Center (IAC), Peace Action West, United for Peace and Justice (UFPJ) expressed their opposition against war with Iran mainly after September 11 th and have been progressive and helpful in some cases. Nevertheless, in spite of their long history of activism and firm institutions could never seriously disobey US government regulations and policies.
