Bayview, Texas, the Immigration and Naturalization Service Processing Center. The camp lies well to the north of the Rio Grande, covering 317 acres of the flatlands beside the Gulf of Mexico. At the end of a long skein of narrow unmarked roads it appears abruptly, as if the horizon had parted to reveal the widely separated buildings, partially obliterated by the glare of the sun. Only a small sign identifies the place known as El Corralón, the big corral, the great animal pen, the concentration camp.
Two chain-link fences, topped with barbed wire and separated by a corridor of…