The prosecution of key figures in the British National Party would not have taken place were it not for former member turned mole, Andy Sykes.
The former BNP mole now works for an anti-racism project
Mr Sykes, a former Bradford organiser for the BNP, turned against his party and helped BBC reporter Jason Gwynne secretly film undercover.
He said his life was changed forever by the documentary.
After receiving death threats, he now lives under high security - but says he is determined to stay in Bradford.
He said: "There are a lot of people out there who have sent me death threats, they don't agree with the documentary that we made.
"I am staying here. I have fantastic security, great neighbours, fantastic family and huge support from the community."
Mr Sykes joined the BNP after becoming concerned about asylum seekers but said he quickly became disillusioned with its actions and ideals.
He began acting as a mole within the party during the Bradford riots in 2001, passing on information about its activities to the Trades Union Congress.
In December 2003, he agreed to introduce Mr Gwynne to other BNP members as an activist and help him to film.
Now a lecturer for an anti-racism project, Mr Sykes said he had no regrets about his actions.