A major manufacturer in the Sioux City area is closing the doors on its fourIowa plants. The Aalfs blue jean company will close its Iowa operations in Novemberputting 500 workers out of a job. The company is closing plants in SiouxCity, Le Mars, Sheldon, Spencer and Yankton, South Dakota. The Sioux Cityplant employs 225. Aalfs officials say they can’t recruit and retain enoughworkers. They also says they’re having trouble competing in the blue jeanmarket. The company says it will keep its outlet store open in Sioux City.