In Britain, for example, members of the radical (but non-violent) Hizb ut-Tahrir movement have appeared on television to express their rejection of the principles of liberal democracy and secular justice.

ECONOMIST: Islam, America and Europe

More recently, Kyrgyz and U.S. officials have been concerned about Hizb-ut-Tahrir, an Islamic separatist group, which has taken root in southern Kyrgyzstan.

CENTERFORSECURITYPOLICY: Rebasing -- and Reequipping -- for Transformation

Travellers in southern Xinjiang say they often see slogans on walls warning people to shun Hizb-ut-Tahrir, an extremist group banned in much of Central Asia that wants to unite Muslims around the world under one caliphate.

ECONOMIST: Xinjiang