Nominated for Best Documentary Feature this year (which it won't win), it's about the Belgium/US coup of Lumumba in 1960.
The jazz aspect is kind of tangential and mostly just serves to give the film a distinctive propulsive rhythm (though I didn't realize Abbey Lincoln was that cool). Mostly it's about decolonial history.
It's a movie made for us, since in my experience it's principally leftists who are familiar with decolonial history. It's got all the players: 
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Sukarno, Nehru, Hammarskjold, Alan Dulles, to the point where I was wondering how a person not already familiar with the history might make sense of it all.
I asked the guy sitting next to me who loved the flick despite not knowing anything about decolonial history, he said there was enough there to help him put it all together.
Anyways, banger flick y'all should check it out.