Matt Donnelly Senior Film Writer Dozens of top Hollywood creatives and activists have signed an open letter in response to the shuttering of production company Participant — imploring the industry to continue to effect change through film and television as the defunct company once did. George Clooney, Aflonso Cuarón, Ava DuVernay, Jane Fonda, Regina King, Viola Davis, #MeToo founder Tarana Burke, civil rights attorney Bryan Stevenson, Color of Change president Rashad Robinson and more are signators, in addition to groups like GLAAD and Human Rights Watch.