Den britiske regjering ønsker å stramme inn reglene som holder ekstremister ute. Det gjelder ikke bare ekstreme islamister, men også nynazister og holocaustfornektere.
Innenriksminister Jacqui Smith vil kunngjøre tiltakene med det første.
There have been 230 barred since 2005 but their identities have only been revealed when they publicly complained about being excluded.
Ms Smith is to reveal the full details of the plans in the next few days.
The BBC’s Nick Ravenscroft said those already blocked include neo-Nazis, holocaust deniers, certain animal rights activists and religious extremists.
The radical Muslim cleric Omar Bakri Mohammed was banned from the UK following the 7/7 terror attacks in London in 2005, when the former Home Secretary Charles Clarke used existing powers to exclude Mr Mohammed as his presence was “not conducive to the public good”.
A Home Office official told the Sunday Mirror the measures were aimed at preventing potential trouble-makers from entering the country and those targeted will be placed on international watch-lists.
He said: “Coming to the UK is a privilege. We don’t want people abusing that by stirring up tensions.”
En talsmann for Liberaldemokratene minnet om problemet med ekstremistene som allerede befinner seg i landet, og problemet med agitasjon og verving over internett.