Disinformation is as old as humanity. When Satan told Eve nothing would happen if she bit the apple, that was disinformation. But the rise of social media has made disinformation even more pervasive and pernicious in our current era. In a disturbing turn of events, governments are increasingly using disinformation to create their own false narratives, and democracies are proving not to be very good at fighting it.

During the final three years of the Obama administration, Richard Stengel, the form...