In November 2020, Tyson suspended multiple top officials and retained the law firm Covington & Burling to conduct an investigation into these allegations. In December 2020, Tyson received the results of the investigation led by former US Attorney General and Covington & Burling partner Eric Holder, and terminated seven of its top managers at the Waterloo, Iowa plant. The Waterloo plant is Tyson's largest pork plant and was the centre of a COVID-19 outbreak that infected more than 1000 Tyson employees, killing six, before spreading into the broader community. Tyson did not publicly disclose the names of those terminated or the detailed findings of the report, but issued a statement saying that those terminated did not represent the company's core values.