Hizb ut-Tahrir (HuT), or the Liberation Party, was founded in 1953 in Jerusalem. The party advocates the politics of pan-Islam by calling for the re-establishment of the Islamic caliphate.
Hizb ut-Tahrir is active in most Muslim countries in addition to Western Europe, North America and Australia. Since the targeted assassination of al-Qaeda leader Osama bin Laden by United States special forces in Pakistan in early May, the Pakistani chapter of HuT has come under increasing media and security attention because of its alleged penetration of the higher reaches of the powerful Pakistani military establishment.
Read complete story: http://atimes.com/atimes/South_Asia/MG08Df01.html
Looks as they are after just the political power and nothing to do with spiritual aspects.
Well, King Faisal tried. Compared to these guys he was an angel. Still, Allah seemed to have other plans.