Question: Mankiller is a 2017 documentary film directed by Valerie Red-Horse Mohl, concerning the life of Wilma Mankiller, was a community organizer and the first woman elected to serve as chief of which organization?
Sentence (from "Mankiller (film)"): It was produced by Red-Horse Native Productions and Valhalla Entertainment and is a presentation of Vision Maker Media for PBS.
Relevant evidence: No