The Federal Trade Commission sued PepsiCo on Friday, alleging that it has engaged in illegal price discrimination by giving unfair price advantages to one large retailer at the expense of other vendors and consumers.

The Federal Trade Commission is suing Pepsi, alleging it has rigged competition by offering unfair pricing deals to a big retailer at the expense of smaller rivals, resulting in higher costs for shoppers.

According to the FTC’s complaint, Pepsi has been providing unfair pricing advantages to one of its largest customers—a major big box retailer—while raising prices for competing retailers and customers. Reuters reports that the retailer is none other than Walmart Inc. WMT , citing a source familiar with the discussions.

The US Federal Trade Commission (FTC) on Friday sued PepsiCo in a last-minute blitz of lawsuits before the end of the Joe Biden administration, alleging that the beverage giant forced many consumers to pay higher prices by giving Walmart unfair pricing advantages,

The commission alleges that the retailer, whose name was redacted in the statement from commissioners, received “unfair pricing advantages” that were not made available to others.

The Federal Trade Commission said Friday that it is suing PepsiCo for illegal price discrimination, alleging the food and beverage giant gave an unnamed retailer more favorable prices than its competition.