Informant follows the story of Brandon Darby--a radical-left activist turned FBI informant through a series of events starting with community support work in the aftermath of Hurricane Katrina in 2005, to the Republican National Convention in 2008. Brandon ends up turning fellow activists to the FBI for making Molotov cocktails in circumstances described by fellow activists as entrapment. So what happened? Did Brandon manipulate fellow activists into doing things they didn't want to do, or were some activists simply not engaging in a full analysis of the effectiveness of their strategies and tactics? In any event, was turning over activists to the FBI the right thing to do, even when nobody was hurt?