Rwanda. 1994 - A Hutu man at a Red Cross hospital, his face mutilated by the Hutu 'Interahamwe' militia, who suspected him of sympathizing with the Tutsi rebels. (James Nachtwey) This famous picture has been reproduced many, many times. I think this is one of the best crops and captions I've seen.
Rwanda genocide considers worst genocide in human history more than one million people were massacred in Rwanda genocide. Rwanda observed public holiday every year to remember victims of Rwanda genocide.