A secret Metropolitan Police unit set up to combat public disorder did little to stop unrest in the first 14 years of its existence, an inquiry has heard.
David Barr KC told the Undercover Policing Inquiry (UCPI) that the quality of the intelligence gathered by officers from the Special Demonstration Squad (SDS) from 1968 to 1982 was not justified in terms of the level of intrusion suffered by members of the public.
