Hizb ut-Tahrir (
Ḥizb at-Taḥrīr;
Party of Liberation) is a radical, international,
pan-Islamic political organisation, which describes its "ideology as Islam", and its aim as the re-establishment of "the Islamic Khilafah (
Caliphate)" or
Islamic state. The new caliphate would be ruled by Islamic
Shariah law, unify the Muslim community (
Ummah), return the caliphate to its "rightful place as the first state in the world", and carry "the
Da'wah [spread] of Islam" to the world.