Excerpt:
A "presumption in favour of exclusion" is being introduced to make it easier to prevent extremists entering the UK, Home Secretary Jacqui Smith has said.
Ms Smith said it would now be up to the individual concerned to prove they would not "stir up tension" in the UK.
For the first time a list of the names of those excluded - including so-called "preachers of hate" - will be published and shared with other countries.
Since 2005 230 people have been barred from entering the UK.
About 80 of them are religious extremists.