Savage Messiah (2002) on Netflix

Plot summary

Roch 'Moïse' Thériault heads a commune in Burnt River, Ontario, where he lives with two men, ten wives and twenty-three children. Paula Jackson, a social worker who pays the community a visit, suspects the women are mistreated. Her colleagues show little interest, so she pursues the matter largely on her own, and what she finds points to physical and psychological abuse and to bizarre rituals. Thériault presents himself as a spiritual guide and handles people and institutions with ease, including the investigators appointed by the court. The inquiry puts Jackson's career and her safety at risk, and she keeps at it, wanting the commune's members out of his grip.