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 (CFPB) filed a lawsuit against Walmart and fintech company Branch Messenger for allegedly compelling over a million delivery workers to utilize costly deposit accounts to access their paychecks.

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.