Reuters / Paul Spella / The Atlantic In August 2014, a Twitter account affiliated with Anonymous, the hacker-crusader collective, declared “full-scale cyber war” against ISIS: “Welcome to Operation Ice #ISIS, where #Anonymous will do it’s [sic] part in combating #ISIS’s influence in social media and shut them down.” In July, I traveled to a gloomy European capital city to meet one of the “cyber warriors” behind this operation.