During World War II, the British formed a secret division, the 'SOE' or Special Operations Executive, in order to support resistance organisations in occupied Europe. It also engaged in 'targeted killing' - the assassination of enemy political and military leaders. The unit is famous for equipping its agents with tools for use behind enemy lines, such as folding motorbikes, miniature submarines and suicide pills disguised as coat buttons. But its activities are now also gaining attention as a forerunner to today's 'extra-legal' killings of wartime enemies in foreign territory, for example...