A probing, ground-level investigation of illegal immigration and the people on both sides of the battle to secure the U.S.—Mexico border. With illegal immigration burning as a contentious issue in American politics, Reuters reporter Tim Gaynor went into the underbelly of the border and to the heart of illegal immigration: along the 45-mile trek down the illegal alien "superhighway." Through scorpion-strewn trails with Mexican migrants and drug...