**This “engrossing history of censorship” is an urgent, timely read for our era of social media tolls, fake news, and free speech debates ( *The Economist* ).** **How restricting speech continuously shapes our culture, props up authorities, and maintains class and gender disparities** Through compelling narrative, historian Eric Berkowitz reveals how drastically censorship has shaped our modern society. More than just a history of censorship, *Dangerous Ideas* illuminates the power of restricting speech; how it has defined states, ideas, and culture; and (despite how each of us would like to believe otherwise) how it is something we all participate in. This engaging cultural history of censorship and thought suppression throughout the ages takes readers from the first Chinese emperor’s wholesale elimination of books, to Henry VIII’s decree of death for anyone who “imagined” his demise, and on to the attack on *Charlie Hebdo* and the volatile politics surrounding censorship of social media. Highlighting the base impulses driving many famous acts of suppression, Berkowitz demonstrates the fragility of power and how every individual can act as both the suppressor and the suppressed.