A joint reporting project by ProPublica and PBS Frontline, “Firestone and the Warlord” reached hundreds of thousands of viewers when it first aired Nov. 18. “Chilling,” Salon wrote. “Gripping,” said Fortune. “An example of the reason we bother to scrutinize history,” said the New York Times. The project provoked conversation and upset among American and Liberian officials, as well as everyday citizens in the African nation whose trail of tears has most recently included the deadly Ebola outbreak.