A still from Rebel Hearts by Pedro Kos, an official selection of the U.S. Documentary Competition at the 2021 Sundance Film Festival. Courtesy of Sundance Institute.. All photos are copyrighted and may be used by press only for the purpose of news or editorial coverage of Sundance Institute programs. Photos must be accompanied by a credit to the photographer and/or 'Courtesy of Sundance Institute.' Unauthorized use, alteration, reproduction or sale of logos and/or photos is strictly prohibited.