British Prime Minister Tony Blair has announced new measures to deport religious extremists who incite hatred.
He said his government was launching a short one-month consultation on new grounds for excluding and deporting people from the United Kingdom.
British Prime Minister Tony Blair:
They would include fostering hatred, advocating violence to further a person's beliefs or justifying or validating such violence.
"Let no one be in any doubt that the rules of the games are changing," Mr Blair said.
He said the government would outlaw Hizb ut-Tahrir, an organisation that says it is dedicated to creating an Islamic caliphate centred on the Middle East but insists it does not support violence.
Mr Blair said the government would also ban a successor organisation to al Muhajiroun, a group that celebrated the September 11th attacks on the United States but is meant to have disbanded.
The Prime Minister said a "handpicked" unit of senior officials, headed by the Government's Intelligence and Security Co-ordinator Bill Jeffrey would be appointed to drive forward the agenda along with the Cabinet's counter-terrorism committee which Mr Blair chairs.
He acknowledged that while the British public had responded with tolerance to the terror attacks on London, that tolerance was in danger of being stretched.
"I am acutely aware that alongside those feelings that there is also a determination that this very tolerance and determination should not be abused by a small fanatical minority and anger that it has," he said.
Under the Terrorism Act 2000, the Home Secretary can proscribe any organisation which he believes is "concerned in terrorism". The process means that membership of the groups becomes an offence, as does fund-raising for them.
Metropolitan Police Commissioner Sir Ian Blair said he believes the public will support the tough new measures.