The Robinson-Patman Act was passed in 1936, but the federal government stopped enforcing it during the deregulation of the 1980s. The FTC resumed its enforcement in December when it sued Southern Glazer’s, the largest U.S. distributor of wine and spirits.

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

The agency claims the soda giant gave “unfair” pricing advantages to a larger retailer, forcing consumers to pay more at competing stores. Pepsi “strongly disputes” the allegations.

The US Federal Trade Commission sued PepsiCo Inc. Friday under a rarely invoked 1930s law called the Robinson-Patman Act that bars price discrimination against retailers.

The Federal Trade Commission on Friday sued PepsiCo, alleging the beverage company forced many consumers to pay higher prices by providing a single large retail buyer with unfair pricing advantages. The lawsuit,

Walmart declined to comment. "The FTC's action will help ensure all grocers and other businesses — no matter the size — can get a fair shake and compete on the merits of their skill, efficiency, and talent,

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.