“As long as people think that the dictator’s power is secure,” Gordon Tullock wrote, “it is secure.” When citizens think otherwise, all at once, a dictator’s power is anything but, as revealed by the collapse of the Soviet Union and the Arab Spring uprisings. This conviction – that power rests on citizens believing in it – has long compelled the world’s autocrats to invest in sophisticated propaganda apparatuses. This chapter provides an overview of the book. Drawing on the first global dataset of autocratic propaganda, we document dramatic variation in propaganda across autocracies: in coverage of the regime and opposition, narratives about domestic and international life, threats of violence issued to citizens, and the events that shape it. Why do autocrats employ different propaganda strategies? The answer, we argue, is political. Where electoral constraints compel autocrats to seek popular support, their propaganda apparatuses must persuade citizens of regime merits. Where autocrats can fully secure themselves with repression, their propaganda apparatuses aim to make this repressive capacity common knowledge among citizens to discourage mass protests.