Based on Isabel Wilkerson's book Caste, DuVernay's film draws a line between India's caste system, the hierarchies of Nazi Germany and the historic subjugation of Black people in the United States.

Shailaja Paik faced prejudice because of her family's Dalit caste and her gender. As a historian she's written ground-breaking books on India's Dalits and is now a MacArthur 'genius grant' awardee.

Instead, he had a more romantic vision of social organization—one centered on close-knit communities. He was unequivocally against discrimination, but he did not believe caste needed to be eradicated ...