In this chapter, we try to analyze the role of the use of fake news in the elections and during the government of Brazilian President Jair Bolsonaro, understood as a method of building political hegemony. We will seek to show how the constant use of fake news creates an atmosphere of factual suppression and establishes a new discursive position for truth in the post-truth era: where the materiality of facts is suppressed by the popular belief in other factors that confer truth status to discourses such. It is in this context that the term “fake news” becomes evident: it is constitutive of the misrepresentation of reality for purposes not only of disinformation, but above all of propaganda. We see today, with the use of fake news by authoritarian groups, an appeal to personal beliefs, especially traditional values and hate speech. Bolsonaro’s supporters on social media, as well as the president’s own pronouncements, often demonstrate a clear persecution of his opponents, mainly by spreading false or inaccurate information to combat them. With this, we will bring here some exemplary statements that circulated widely during the 2018 presidential campaign in Brazil and during the Bolsonaro government, especially during the most critical period of the COVID-19 pandemic, to illustrate how his followers, as well as himself, use fake news as a constitutive method of their discourses, inciting a hate speech and constant persecution of their political opponents, configuring a practice generally typical of antidemocratic conceptions.