Posted on August 23, 2014
Any groups believed to be inciting someone into terrorism could also be banned, even if this could not be proved, said the home secretary.
In response, Labour said more detail was needed on the specific powers.
Ministers have been urged to step up their response to extremism at home following the murder of US journalist James Foley by Islamic State militants operating in Iraq and Syria.
UK police and security services are trying to identify a jihadist with an English accent who appeared in the footage of Mr Foley’s killing.