The jihadist group ISIS (the Islamic State of Iraq and Syria) has been wreaking havoc in northern Iraq and Syria. But its reign of terror is not confined to the Middle East. Its 2014 beheadings of American journalist James Foley and Israeli-American journalist Steven Sotloff have shocked the world and instilled fear in the hearts of many Westerners.
ISIS is the wealthiest, most technologically advanced, and most powerful terrorist organization...