The United States Postal Service is hiring armed security guards through a multinational private contractor with a history of alleged human rights abuses and price fixing, according to a Raw Story investigation.

USPS has a contract with Prosegur, a multinational security firm, to provide armed guard services, according to public records obtained by Raw Story through a Freedom of Information Act request.

The government redacted the monetary amount of the contract.

Current and former USPS employees detailed alleged abuses by Prosegur-hired security guards and raised questions about supervision and training for armed security officers (ASOs), who are now working at dozens of facilities across the country and clocking thousands of weekly hours.

Researchers also sounded the alarm on Prosegur’s controversial history in Latin America.

“It’s not a great company in Latin America, so I wouldn’t trust it in the U.S. either,” said Mark Ungar, a political science professor with the John Jay School of Criminal Justice in New York.