The first half of the twentieth century was a murderous period as political ideologies grew into wars that killed tens of millions of people. Fear of Communism sparked a hysteria in the United States that led to two red scares and the rise and fall of McCarthyism. This book looks at the events that created credible concerns about Communism and those that allowed baseless allegations to ruin the lives of innocent Americans. A timeline plots the history of anti-Communist feeling in the United States.