UK thugs infiltrated protests against the Vietnam War, and many other political causes.

* Barr said that mainly leftwing groups were infiltrated "as well as groups campaigning for social, environmental or other change" such as anti-nuclear causes. He also said trade unionists and groups opposing racism were spied on. Far-right groups were also infiltrated.*

*"The information reported by these undercover police officers was extensive. It covered the activities of the groups in question, and their members. It also extended to the groups and individuals with whom they came into contact, including elected representatives. Reporting covered not only the political or campaigning activities of those concerned but other aspects of their personal lives."*