Auto parts suppliers, which employ nearly 900,000 people nationally and 40,000 in Illinois, are letting jobs go unfilled, and some have reported selling their businesses and shuttering factories, said Ann Wilson, senior vice president of government affairs at the Motor and Equipment Manufacturers Association in Washington, D.C. They are squeezed not only by higher domestic steel prices but because they are paying high tariffs on certain specialty metals they can only get abroad, and those that import component parts like motors and sensors for further manufacturing are confronting tariffs on those goods too, she said.