Late one July night in 2020, armed men, identified only by the word POLICE written across their uniforms, began snatching supporters of Black Lives Matter off the street in Portland, Oregon, and placing them in unmarked vans. These mysterious actions were not carried out by local law enforcement or even right-wing terrorists, but by the U.S. Border Patrol. Why was the Border Patrol operating so far from the boundaries of the United States? What were they doing at a protest that had nothing to do with immigration or the border? is the untold story of how, through a series of landmark but largely unknown decisions, the Supreme Court has dramatically curtailed the Fourth Amendment of the Constitution in service of policing borders. The Border Patrol exercises exceptional powers to conduct warrantless stops and interrogations within one hundred miles of land borders or coastlines, an area that includes nine of the ten largest cities and two thirds of the American population. Mapping the Border Patrol’s history from its bigoted and violent Wild West beginnings through the legal precedents that have unleashed today’s militarized force, Guggenheim Fellow Reece Jones reveals the shocking true stories and characters behind its most dangerous policies. With the Border Patrol intent on exploiting current laws to transform itself into a national police force, the truth behind their influence and history has never been more important.