Beck 309-310: "[T]he vast majority of Border Patrol time, money, and manpower was spent pursuing, apprehending, and deporting people who had crossed the border not to set off a pipe bomb but simply to find work [...] These workers made up the surplus populations of Mexico and Central America. The purpose of the supercharged post-9/11 border control apparatus was to control, manage, and discourage them."
worth noting, by way of background, that these "surplus populations the Border Patrol hunted were to a substantial degree an American creation as well. Since the 1990s, much of the unauthorized migration across the southern border has been a consequence of the North American Free Trade Agreement (NAFTA)"
"NAFTA eliminated almost all of the import tariffs that Mexico had long used to protect its domestic agricultural production from penetration by American agricultural goods, which were usually cheaper because they were produced on a much larger scale"
"This development is sometimes credited with aiding the growth of the Mexican middle class, who became able to afford goods that had previously been out of reach. But those benefits are only from the perspective of consumers, whereas the consequences for Mexican workers were disastrous"
and American workers: "manufacturing gains in Mexico produced a further hollowing out of America's industrial workforce, while increased market share for America's agricultural behemoths devastated Mexican industries such as corn production"
see A. Naomi Paik's Bans, Walls, Raids, Sanctuary: Understanding US Immigration for the Twenty-First Century (2020)