Page last updated at 00:07 GMT, Thursday, 20 October 2011 01:07 UK

Undercover PC 'corrupted' trial

So far this year there have been no fewer than eight inquiries set up, after the discovery that undercover police have been used to infiltrate political organisations.

There may be a ninth soon, because Newsnight has evidence of another operation, in which undercover policemen may have given false evidence in court.

The officer became an activist in the Reclaim the Streets campaign, and was arrested after a group from the campaign occupied an office.

Richard Watson reports.

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