Vilified by some and venerated by others as the FBI informant largely responsible for the imprisonment of two youths following the 2008 Republican National Convention, Darby was once a charismatic activist mythologized by the American Left for his daredevil aid work in New Orleansâ Ninth Ward in the aftermath of Hurricane Katrina. Informant meticulously constructs a portrait of his lifeâbefore and after the death threatsâthrough intimate interviews with Darby and tense reenactments starring the man himself.