A "dictator" is a head of state who exercises arbitrary authority over the lives of his citizens and who cannot be removed from power through legal means. The worst commit terrible human-rights abuses. This present list draws in part on reports by global human-rights organizations, including Human Rights Watch, Freedom House, Reporters Without Borders and Amnesty International. While the three worst from 2005 have retained their places, two on last year's list (Muammar al-Qaddafi of Libya and Pervez Musharraf of Pakistan) have slipped out of the Top 10-not because their conduct has improved but because other dictators have gotten worse....