Hizb ut-Tahrir is an international Islamic organization that openly calls for restoration of the caliphate -- that is, the political union of Muslims worldwide in a single Sharia state ruled by the caliph. This means that the group is dedicated to subverting and destroying all governments not ruled by Islamic law, and as such it is banned in many countries. But not in the U.S., which has never shown any awareness on an official level of non-violent efforts to impose Sharia. They're once again coming to the Chicago area to hold their Caliphate Conference: it will be held on June 17 in Rolling Meadows, Illinois.
What is especially noteworthy about this is that absolutely none of the self-professed "moderate" Muslim leaders in the U.S. will disavow Hizb ut-Tahrir or its goals.
And note also that these people have no problem getting space in a hotel for their conference advocating a political system that will destroy freedom of speech, freedom of conscience, and equality of rights of all people before the law, but freedom fighters trying to resist Sharia and Islamization are hounded out of public spaces with increasing frequency.
Video thanks to Blazing Cat Fur.