In 1971, tensions between inmates and guards at the Attica Correctional Facility come to a head in the early hours of September 9 when inmates from the maximum-security prison in Upstate New York launched into the largest and bloodiest prison riot in US history. Through original interviews with former inmates, family members of the hostages, and those who witnessed the rebellion firsthand, Attica brings us back to a moment in time that resonated for decades, weaving hundreds of hours of never-before-seen, archival footage from inside the prison. The film captures the people, politics, emotions and tragedy, which continue to serve as a wake-up call about the need for prison reform and a reminder of the responsibilities of justice.