In this book David Block draws on analytical techniques from Critical Discourse Studies to critically investigate truth, truths, the propagation of ignorance and post-truth. Focusing on corrupt discourses and agnotology, he explores the role of anti-intellectualism, emotion and social media in the cultural creation, legitimisation and dissemination of ignorance. While encompassing analysis of discourses on Donald Trump, Brexit, climate change and the Alt-Right, Block furthers our understanding of this global phenomena by providing a revealing analysis of political communications relating to corruption scandals involving the Spanish conservative party. Through an innovative theoretical framework that combines critical discourse and discourse historical approaches with nuanced political analysis, he uncovers the rhetorical means by which esoteric truths and misleading narratives about corruption are created and demonstrates how they become, in their turn, corrupt discourses. This original work offers fresh insights for scholars of Discourse Analysis, Sociolinguistics, Politics, Cultural and Communication Studies, and will also appeal to general readers with an interest in political communication and Spanish politics.