The term "Iz Al-Din Al-Qassam Battalions" is often synonymous with Hamas, a Palestinian Islamic political organization. Other synonyms for this term include Qassam Brigades and Al-Qassam Brigades. The group is known for its militant activities and has been involved in numerous attacks against Israel. In addition to their military operations, the group is also involved in providing social welfare services to the Palestinian people. The name of the group is derived from Sheikh Izz ad-Din al-Qassam, a Palestinian nationalist and Islamic preacher who led a revolt against British colonial rule in the 1920s. Despite facing international condemnation, the group continues to be a significant player in Palestinian politics.