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.
11 powerful photos from the aftermath of the Rwandan genocide
Genocide in Rwanda. Refugees wait behind barbed wire as they watch aid workers unload a new batch of supplies and food, at a refugee camp at the Kigera River border crossing with Rwanda. (Michael S. Williamson/The Washington Post)