On September 22, 1975, 45-year-old Sara Jane Moore took a revolver out of her purse and fired two shots at President Gerald Ford on a crowded sidewalk in San Francisco’s Union Square. This failed political assassination was destined to become a strange historical footnote, yet Moore is revealed as an extraordinary subject in this expansive, fascinating new documentary by the protean Robinson Devor (The Woman Chaser, NYFF37). Having served more than 30 years of a life prison sentence, Moore tells her own story, from FBI informant to would-be assassin, all of which Devor dramatizes against the backdrop of the era’s prevalent political unrest and militancy, of Attica, the Black Panthers, the U.S.-backed Chilean coup, and the Symbionese Liberation Army. A pugnacious and unapologetic interview subject, Moore holds the center of a fleet and compelling nonfiction drama with the feel of a 1970s thriller.