More than 400 workers thrown suddenly off the job by AFA Foods Inc.'s collapse are pushing to have the failed meat processor's chapter 11 case converted to a chapter 7 liquidation, Dow Jones DBR Small Cap reported today. AFA's ground-beef plants were sold in recent months, raising enough money to pay off first-lien lenders and a bankruptcy loan. But there won't be anything for unsecured creditors, including the workers who say they are owed $4 million worth of benefits under federal laws protecting employees from sudden job loss, according to AFA's court papers.