''The suspects deliberately performed clandestine anti-Russian and anti-constitutional activities. They incited religious hatred by propagating their doctrines among the population, recruited new followers and prepared and disseminated extremist information,'' the Russian Prosecutor General's office said today.
Hizb ut-Tahrir, which calls itself a political party, is not classified as a terrorist organisation by the United States.
The group, which seeks to unite all Muslim countries into a unitary Islamic state, claims that it seeks to achieve its goals through peaceful means.
Russia, however, accuses the movement of having links to radical Islamist groups in Chechnya, and it was placed on a list of banned organisations by the country's Supreme Court in 2003.

HuT is the same group that held an act in Indonesia to push for a “Global Caliphate”, have posted propganda extremist videos on Youtube (with mentions to European colonialism and support for Palestinian terrorists) and have incited war on the West.
Not only the Urals has seen a growth in HuT activities. Central Asia is seeing also a growing influence of this group, after receiving ex-jihadists from Afghanistan.
Related links:

1. Bashkortostan | Wikipedia
2. HuT America: Preaching hate, building a caliphate | IPT.  While HT (the "Party of Liberation") says it is committed to advancing radical Islam by nonviolent means, it advocates violence (see here, here and here) and its prominent alumni include terrorists like Khalid Sheikh Mohammad and Abu Musab Zarqawi along with suicide bombers.
3. HuT’s activities in the United States: The Jamestown Foundation.
4. Hibz ut-Tahrir al-Islami | GlobalSecurity.org.