Britain will publicly list and ban entry of more than 200 people whose extremist views and "violent messages" are a threat to national security, the home secretary said. The plan announced by Home Secretary Jacqui Smith would group together Muslim extremists, animal rights protesters, anti-abortion activists, neo-Nazis and others she said "encourage or spread extremism and hatred through preaching violent messages." The list would include only people from abroad. Smith said publishing the names -- roughly 230 -- amounts to a toughening of existing exclusion orders that already list and ban certain groups from Britain. Authorities expect to publish the list on the Home Office website in the coming months. American officials say there are fewer than 16,000 names on the Transportation Security Administration lists used to screen airline passengers in the US. The names come from a broader watch list that FBI counterterrorism officials say contains about 400,000 people of interest. The TSA lists, created to combat terrorism after the September 11 attack, have caused problems for some travellers with similar names. As of September 30, more than 43,500 requests had been filed by people who think they were mistakenly identified as a terrorist, the TSA says. British authorities hope their new list will amount to "naming and shaming" extremists and will act as notices to keep them out of the United Kingdom. But British rights groups complained that the latest Home Office plan will do nothing to shame extremists into moderating their views. "The threat of terrorism is real, and none of us in the Muslim community believe otherwise," said Mohammed Shafiq of the Ramadhan Foundation, a British youth organisation.