Companion suits are being filed this week in Pennsylvania, New Jersey and elsewhere. Each seeks at least $5 million in damages.
The named Pennsylvania plaintiffs, Thomas and Gerald Greenberg of Ambler, said they buy six cases of the affected Anheuser-Busch products a month. They did not immediately return a message Tuesday, and Boxer would not elaborate on their purchases except to say the consumer-protection suit does not involve retailers or bar owners.
One of the California plaintiffs, Nina Giampaoli of Sonoma County, said she bought a six-pack of Budweiser every week for the past four years.
"I think it's wrong for huge corporations to lie to their loyal customers — I really feel cheated. No matter what the product is, people should be able to rely on the information companies put on their labels," Giampaoli said in a news release issued by Boxer's law firm.
Bloomberg News first reported Tuesday on the lawsuits.
In a telephone interview with The Associated Press, Boxer said he has evidence to corroborate the former employees' allegations, but stopped short of saying the beers had been independently tested.
"AB (Anheuser-Busch) never intends for the malt beverage to possess the amount of alcohol that is stated on the label. As a result, AB's customers are overcharged for watered-down beer and AB is unjustly enriched by the additional volume it can sell," the lawsuit said.