CHINO, Calif. -- Last year, a man carrying a hidden video camera took a $12-an-hour job at a little-known beef slaughterhouse here. Now the meatpacker is about to collapse, and has become a flashpoint in a national debate over meat safety and the quality of food Americans serve their schoolchildren.

Hallmark/Westland Meat Packing Co., one of the biggest suppliers of beef to the national school-lunch program before videos showing animal cruelty at the plant helped trigger the biggest meat recall in U.S. history, probably will...