From the establishment of the Special Demonstration Squad in 1968, annual reports were published to justify their continued existence. The first 15 year batch of these were some of the first documents to be released by the Undercover Policing Inquiry, you can read them for yourself https://www.ucpi.org.uk/search-results/?fwp_type=annual-report

Chris Brian From the Undercover Research Group has read them all, in this episode he tells Tom Fowler the highlights and lowlights covered in the documents, from the death of Kevin Gately https://pasttenseblog.wordpress.com/2019/06/15/today-in-london-anti-fascist-history-1974-the-death-of-kevin-gately-opposing-national-front-demo/ to the Grunwick strike https://grunwick40.wordpress.com and a great deal more besides.

These documents represent the link between the grubby role of the secret undercover political police with the civil service and politicians. Chris mentions a PHD on this topic, which you can read here:

https://research.edgehill.ac.uk/en/studentTheses/thatchers-culture-of-conformity-the-disintegration-of-partystate-

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