Why did undercover cop Mark Jenner infiltrate Hackney campaigns in the 1990s? The Special Demonstration Squad's Mark Jenner was deployed using the name Mark Cassidy. The Undercover Research Group's extensive profile of Jenner shows the range of issues he spied on - anti-racist campaigns, trade unions, Irish republicanism and Hackney community campaigns. He chaired meetings, … Continue reading Big Brother – Who’s Watching You? Mark Jenner meeting