The United Front was an organisation led by Alexsandr Karadjic which opposed the policies of the New Britannia Party. In 2002, it committed several terrorist activities to frighten people into opposing them.
The Fearmonger fed on the fear generated by the Front's activities, which eventually led to riots breaking out in London. The Seventh Doctor exposed the NBP's funding of the Front on Mick Thompson's radio show, leading to the arrest of its leader. (AUDIO: The Fearmonger)