A Democratic-led House panel is launching a probe into coronavirus outbreaks at meatpacking plants and whether the Occupational Safety and Health Administration adequately enforced worker safety rules.Rep. James Clyburn, D-S.C., chairman of the House select subcommittee on the coronavirus crisis, sent letters Monday to Tyson Foods — which has facilities in Waterloo — Smithfield Foods and JBS USA requesting information on the number of sick employees, facility closures, safety measures and leave policies for when workers tested positive.