Never-before-seen testimony is included in this documentary on Emmett Louis Till, who, in 1955, was brutally murdered after he whistled at a white woman.

Canadian Lt. General Romeo Dallaire was the military commander of the UN mission in Rwanda and this movie is personal and, all too true, story of his time there during the genocide of 1994. It is not quite as moving as the earlier Hotel Rwanda and is less geared to drama and emotional manipulation, but it is still grim and upsetting.

Most people don't think about singing when they think about revolutions. But song was the weapon of choice when, between 1986 and 1991, Estonians sought to free themselves from decades of Soviet occupation. During those years, hundreds of thousands gathered in public to sing forbidden patriotic songs and to rally for independence. "The...