The United States Postal Service violated federal law by letting employees do union-funded work for Hillary Clinton’s campaign and other Democratic candidates while on leave from the agency, according to an Office of Special Counsel report obtained by Fox News.

The OSC determined the USPS “engaged in systemic violations” of the Hatch Act, a federal law that limits certain political activities of federal employees. While employees are allowed to do some political work on leave, the report said the Postal Service showed a “bias” favoring the union’s 2016 campaign operation.

The investigation was launched months ago after Senate Committee on Homeland Security and Governmental Affairs Chairman Ron Johnson, R-Wis., brought constituent complaints to the OSC in October. The constituent, identified as a USPS employee, was concerned the Postal Service “incurred unnecessary overtime costs” and “improperly coordinated” with the National Association of Letter Carriers (NALC) when it released members for several weeks of “union official” leave without pay to participate in campaign work.

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