Source:
The GuardianPolice chiefs are facing damaging allegations that they authorised undercover officers embedded in protest groups to give false evidence in court in order to protect their undercover status.
Documents seen by the Guardian suggest that an undercover officer concealed his true identity from a court when he was prosecuted alongside a group of protesters for occupying a government office during a demonstration.
From the moment he was arrested, he gave a false name and occupation, maintaining this fiction throughout the entire prosecution, even when he gave evidence under oath to barristers. The officer, Jim Boyling, and his police handlers never revealed to the activists who stood alongside him in court that he was actually an undercover policeman who had penetrated their campaign months earlier under a fake identity.
Boyling was undercover, using the name Jim Sutton, between 1995 and 2000 in the campaign Reclaim the Streets, which organised colourful, nonviolent demonstrations against the overuse of cars, such as blocking roads and holding street parties.
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http://www.guardian.co.uk/uk/2011/oct/19/police-undercover-officers-court-perjury-claim