The federal government is suing Walmart and the fintech company Branch Messenger, accusing the companies of forcing employees to use specific accounts to access their pay and of opening the accounts on the employees’ behalf.

The Consumer Financial Protection Bureau filed a complaint Monday against Walmart and Branch Messenger for allegedly forcing delivery drivers to use costly deposit accounts in order to get paid.

The U.S. consumer finance watchdog accused Walmart and the workforce payments company Branch Messenger on Monday of forcing more than a million delivery drivers into using accounts that cost them more than $10 million in junk fees.