Forty years ago, my father was the plant manager for a large company in Gardena, Calif., that manufactured mirrors. Many of the factories in the area employed people from Mexico and Central America who were here illegally. In that part of Los Angeles County, hiring illegal immigrants was and still is a common practice. My father would describe the raids on these plants in great detail. In the mid-1960s, every so often, the Immigration and Naturalization Service would conduct raids on the factories. Officers would run into the factory unannounced and try to grab as many illegal immigrants as they...