First, the government would have to show that one or more people entered illegally. Second, that you either knew or recklessly disregarded the fact that they entered illegally. Third, that you transported them inside the U.S. (picked them up in a car). And fourth, that you acted willfully in a manner that furthered their illegal entry.
This is a fifth element that elevates, or makes the crime more serious, if it is alleged that you committed this offense for commercial advantage or private financial gain.