The cults and propaganda surrounding dictatorships, from Hitler and Stalin to Mao Zedong and Kim Il Sung, are revealed in a new book by the Dutch historian Frank Dikotter. 'How to Be a Dictator' describes how these men built their regimes and maintained their public images and how those dictatorships influenced Vladimir Putin, Xi Jinping, and Recep Tayyip Erdogan. Now these leaders are using new technologies to target citizens directly, exploiting the cult of personality to achieve the illusion of popular approval without ever having to resort to elections.