evidence: Sound of Freedom endorsed by Mel Gibson Despite the mixed reception from the critics, Sound of Freedom has been performing incredibly well at the box office following a shaky development and subsequent endorsement from numerous celebrities, including Mel Gibson. [...] It’s reported that the filmmakers battled to buy back the rights for Sound of Freedom, which garnered numerous endorsements from A-listers. Mel Gibson shared a video in which he urged people to go and see the film. "One of the most disturbing problems in our world today is human trafficking, and particularly the trafficking of children," he said. "Now, the first step in eradicating this crime is awareness… go see Sound of Freedom."