American politics have become increasingly polarized over the past several decades. As the two primary parties have moved further apart, so have those whose beliefs fall on the extremes of the political spectrum. This book features articles that examine the ideas and actions of political extremists from across the spectrum, ranging from single-issue groups like Second Amendment and anti-abortion radicals, to larger movements such as anti-government activists and the growing presence of white nationalists. With the reporting, photography, and media literacy questions and terms collected here, readers will discover that while these groups may operate on the fringes of American politics, the echoes of their positions resonate into the mainstream.