More than 30,000 grocery store workers are on strike in New England after negotiations stalled between the workers, represented by the United Food and Commercial Workers, and Stop & Shop, the region’s biggest grocery chain.

“Stop & Shop’s parent company, Ahold Delhaize, saw over $2 billion in profit last year and got a US tax cut of $225 million in 2017,” the union said in a statement. “While Stop & Shop continues to propose drastically cutting worker benefits, Ahold shareholders voted on April 10 to give themselves an 11.1 percent raise in dividends over last year. The expected payout will be on April 25 for around $880 million.”

Sen. Elizabeth Warren joined workers at a picket line on Friday, bringing donuts and telling them, “You fight for the dignity of working people.” Sens. Kamala Harris, Kirsten Gillibrand, Cory Booker, and Bernie Sanders also tweeted their support, as did fellow Democratic presidential candidate Julián Castro and numerous Democratic members of Congress.

What you can do: DON’T cross the picket line. DO contact your local store to let them know you support the workers and want management to offer a fair deal. DO express support for workers on social media and, if you pass a picket line, in person. DO keep shopping at union stores if there’s one near you—see that list for options.