Hizb ut-Tahrir, also known as the "Party of Liberation" or "Party of Emancipation," is an international political organization that seeks to establish an Islamic state, or Caliphate, across the Muslim world. Despite being banned in some countries for its controversial views and perceived links to extremism, the group has supporters and members in over 40 countries. Synonyms for Hizb ut-Tahrir include the Islamic Liberation Party, the Muslim Liberation Party, and the Islamic Party of Liberation. The organization's ultimate goal is the restoration of Islamic governance, which it views as the solution to social, political, and economic problems facing Muslim communities worldwide.