Amassing unimaginable amounts of personal data, giants like Google, Facebook, Amazon, and Apple—once symbols of American ingenuity and freedom—have become a techno-oligarchy with overwhelming economic and political power. Decades of unchecked data collection have given Big Tech more targeted control over Americans’ daily lives than any company or government in the world. In The Tyranny of Big Tech, Senator Josh Hawley of Missouri argues that these mega-corporations—controlled by the robber barons of the modern era—are the gravest threat to American liberty in decades.