If we ban them, will we still keep an eye on them?

So Islam4UK are to be banned for holding extremist views.

Guardian.

The Islamist group Islam4UK, which planned a march through Wootton Bassett, and its "parent" organisation, al-Muhajiroun, will be banned under new legislation outlawing the "glorification" of terrorism, Alan Johnson announced today.
The order, which will come into effect on Thursday, will make it a criminal offence to be a member of either of the groups, punishable by up to 10 years in prison.
"I have today laid an order which will proscribe al-Muhajiroun, Islam4UK, and a number of the other names the organisation goes by," Johnson said. Other names are Call to Submission, Islamic Path and London School of Sharia. The group is already proscribed under two other names – al-Ghurabaa and the Saved Sect or the Saviour Sect.
Johnson said that proscription was "a tough but necessary power to tackle terrorism", adding that it was "not a course we take lightly".
The decision, based on months of monitoring the output of websites and comments by senior figures, will have to be endorsed by parliament. Al-Muhajiroun was founded by Omar Bakri Muhammad and Anjem Choudary, and has been operating in Britain since the mid-1980s.

All well and good, but I suspect they'll just found another group and so on ad infinitum, what they really need is their citizenship revoked and carted off to Shariastan where they can live the life they so desire at their own expense. That however is the authoritarian in me speaking, the libertarian in me says let them believe what they want so long as they don't affect me and mine, problem being that they do and they support those who want to do me and mine a great deal of harm, they're unlikely to persuade me to follow their lunatic version of Islam either, certainly not by the violence they support.
Another group that Mr Johnson should also be looking at is the UAF, they too support violent protest and believe in silencing any and all dissent of alternative views albeit coached in terms of fascism, something whose methods they fully support despite their opposition to the supporters thereof.

However I doubt that Mr Johnson will do any such thing, the UAF are the governments brownshirts and they have a measure of control over them, something they'd lost with Islam4UK, which I suspect is the real reason for the ban.