Keith, a friend of mine, worked on this documentary short, "Hakani". It spells out, (with disturbing clarity) what still takes place within many of Brazil's indigenous tribes: infanticide.
Hakani is about one of the few fortunate ones. She is a survivor.
In short, hundreds of children each year are buried alive by their families if they are mentally or physically challenged, or even presumed "soulless" or "cursed" by tribe elders or witch-doctors. Unfortunately, only a few of the families rebel against these death sentences.
Amazingly, the Brazilian government remains split over the necessity to include these people among the nation's constitutional bylaws that protect humans from heinous acts like this.
Getting the word out to the rest of the world is what this film is about, and it is certainly part of what will sway the world to pressure human-rights protection in this matter.
Please watch this doc directed by David Cunningham. It is not easy to sit through, but it is "important" enough to warrant your time.