Al-Muhajiroun is a radical Islamist group that has been banned in several countries for its extremist ideology and involvement in terrorism. This group has been known under various names such as Muslims Against Crusades, Islam4UK, and British al-Qaida. Other synonyms that have been associated with al-Muhajiroun include Salafi Jihadist, Wahhabi, and Takfiri. These terms are used to describe groups or individuals who adhere to a strict interpretation of Sunni Islam and advocate violence against non-Muslims and moderate Muslims. While the terminology used to describe al-Muhajiroun may vary, it is important to remember that their views are not representative of the vast majority of Muslims.