Every country has its villains. But some leaders were so cruel, so diabolically efficient in spreading death, oppression, and suffering, that their legacies are written not in ink, but in blood. These tyrants turned nations into slaughterhouses, citizens into prey, and power into a weapon of unspeakable cruelty. Here are 10 of the most hated political figures in world history, the faces of evil that the world can never, will never, forgive. 1. Adolf HitlerNo surprises here. If evil were pe