WASHINGTON (AP) — The Congressional Black Caucus on Tuesday called on major corporations across the U.S., including those that previously expressed support for voting rights and racial justice, to oppose redistricting efforts by Republican-led states that seek to eliminate majority-Black U.S. House districts.

In a letter sent to more than 250 companies, members of the Black Caucus urge them to condemn the redistricting efforts, which the lawmakers describe as “coordinated efforts to silence Black voices at the ballot box.” Some of the companies had co-signed their own message to Congress five years ago urging lawmakers to pass the John Lewis Voting Rights Act, a Democratic proposal to restore and update the Voting Rights Act.

That 2021 coalition, Business for Voting Rights, was backed by many of the country’s most valuable and influential companies, including Apple, Amazon, Google, Meta, Microsoft, Tesla, Salesforce, Target, PayPal, Intel and Starbucks.

Tuesday’s letter is the latest effort by the Congressional Black Caucus and its allies to gather support for preventing more Republican-led states from redrawing their legislative maps in ways that would dilute Black political representation. Several states have moved to eliminate congressional districts represented by Black Democratic lawmakers after a U.S. Supreme Court ruling last month that severely weakened a key provision of the Voting Rights Act.

“Corporations that have profited from Black consumers, relied on Black workers, and amassed wealth in part from Black communities cannot look away while Black political power is dismantled in plain sight,” Rep. Yvette Clarke, chair of the Black Caucus, said in an interview.

Clarke described the letter as “putting corporate America on notice,” but she said the caucus was not seeking an adversarial relationship with corporations. Among those receiving Tuesday’s letter were companies based overseas that have a significant presence in the U.S.

The caucus last week called for Black athletes to boycott public universities in states that are gerrymandering their congressional maps to eliminate districts held by Black lawmakers. The 59-member Congressional Black Caucus consists entirely of Democrats, including more than a third from Southern states.

Some lawmakers have said mass protests and federal legislation might be necessary to undo the efforts underway in Republican-led states. Any new federal voting rights law would almost certainly require Democrats to secure majorities in both chambers of Congress and win the presidency.