Cross-border undercover networks are a 'global puzzle'
More light has been shed recently on a particularly hidden area of undercover policing. The Mark Kennedy controversy helped to provide a little glimpse of this, but much remains unknown.
During his seven years infiltrating the environmental movement, Kennedy spent quite a lot of time spying on, and disrupting, activists in other countries.
The Channel Four documentary on him called him 'the go-to cop for foreign governments who needed information about their own activists'.
He was deployed in 11 countries on 40 occasions, according to one official report. These countries included Germany, Denmark and Iceland. In Denmark, for instance, he says that he infiltrated a Danish community centre that had housed progressive causes for more than a century, obtaining intelligence to help police storm it and close it down in violent raids.