The Terrorism Act 2006 makes glorifying terrorism a criminal offence.
But File on 4 has found disturbing evidence about the way young UK Muslims are being brainwashed into extremist ideologies and coerced into street crime and jihad.
A disparate collection of extremists are using a variety of methods to preach what one leading Muslim calls a "distortion" of Islam.
On the web the next generation of terrorist sympathisers are groomed with words of hate praising those who bombed London on 7 July 2006.
While at universities covert speakers are exhorting extremism on campuses with university authorities either unwilling or unable to stop them.
And street thugs are being incited to acts of violence and petty crime in a toxic combination of gang warfare mixed with political extremism.
Richard Watson asks if the Government and security agencies are doing enough to prevent a generation being converted to terrorism.
Download or subscribe to this programme's podcast
Most Popular Now | 55,871 people are reading stories on the site right now.";