" The work was to be done ‘by undercover men, spies and saboteurs, who, if caught, would be neither acknowledged nor defended by their government’. They would be working outside the law and were to borrow their tactics from guerrillas and gangsters like Michael Collins in Ireland and Al Capone in America. In signing up for Section D, they were effectively signing away their lives. "

― Giles Milton , Churchill's Ministry of Ungentlemanly Warfare: The Mavericks Who Plotted Hitler's Defeat