Mark Kennedy infiltrated anarchist and activist groups and campaigns between 2003 and 2010 under the name of ‘Mark Stone’. As far as we know, he was involved with groups and individuals in the UK, Iceland, Germany, France, Denmark, the US and Spain where he gathered information for different police forces, sometimes unofficially, sometimes as part of formal international operations. He continued in similar roles for the private sector after leaving the police, and set up at least two of his own companies.