Green's feature-length documentary film "The Weather Underground" focused on the group of violent extremists of the same name, who during the late 1960s and '70s attempted to violently overthrow the United States government. The film premiered at the 2003 Sundance Film Festival and was nominated for a 2003 Academy Award for Documentary Feature category. The award winning film interweaves extensive archival material with modern-day interviews to explore the story of the Weather Underground. "The New York Times" film critic Elvis Mitchell called the documentary a "terrifically smart and solid piece of film-making."