From apartheid to Tammy Faye, Sundance documentaries packed punch

(CNN) -- The documentary category at this year's Sundance Film Festival was especially rich. Entries dealt with social and legal injustice, shed light on their subjects' painful pasts and helped start dialogues that could culminate in a healing process. Here's a look at three of the best:

"Long Night's Journey Into Day" -- The Grand Jury Prize in the documentary category went to this film, co-directed by Frances Reid and Deborah Hoffmann. It documents the painful story of South Africa's post-apartheid Truth and Reconciliation Commission by focusing on four personal stories.

The first features the story of Amy Biehl, an American Fulbright scholar who was killed in 1993. The next story looks at Eric Taylor, a former security guard who took part in the murder of the Cradock Four, a successful group of anti-apartheid activists.

We then meet Robert McBride, a leading African National Congress activist who was responsible for a car bomb that killed three women in a Durban bar. Finally, the focus shifts to the story of Thapelo Mbelo, a black police officer involved in the murders of seven young black men living in one of South Africa's many segregated townships.

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