Dark Money: how a documentary became a political thriller - the guardian

Set against the beautiful but scarred backdrop of Montana, the documentary Dark Money opens like a political thriller. John Ward, running for re-election to the Montana house of representatives, has been the victim of a vicious campaign against him – a series of leaflets attacking his credibility issued by a shadowy organization,....
https://www.theguardian.com/film/2018/jul/13/dark-money-film-political-thriller-campaign-finance