A data breach from a firm that helped states process new unemployment claims at the beginning of the pandemic has affected thousands of people.

Under the CARES Act, the federal government added $600 to unemployment checks that were distributed by states and allowed individual contractors who were not previously eligible for unemployment to file for checks as their businesses closed. Deloitte, an accounting firm, helped Ohio, Illinois, and Colorado set up online portals to allow those states to process unique unemployment filings.