Company to wind down operationsThousands of workers at riskYellow intends to pay back U.S. government loanAug 7 (Reuters) - Some 30,000 workers at Yellow Corp (YELL.O) were looking for jobs on Monday after the major trucking company filed for Chapter 11 bankruptcy protection, potentially saddling U.S. taxpayers with losses from a government rescue of the long-troubled carrier.The nearly 100-year-old company, which halted operations on July 30, has been a dominant player in the "less-than-truckload" segment that hauls cargo for multiple customers on a single truck.It laid blame for the bankruptcy,...