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

Outgoing agency Chair Lina Khan has filed a raft of measures during her last week in office.

The U.S. Federal Trade Commission sued PepsiCo on Friday for offering preferential pricing to a large retailer, whom a source familiar with the matter confirmed was Walmart .