“Shame on you @PramilaJayapal for abandoning the people by endorsing Shontel Brown, the corp dark money candidate over @ninaturner, champion of M4A, GND & working people,” Sarandon tweeted on Monday. “Your compromises have failed & people are suffering because of your ambition.”

The Congressional Progressive Caucus (CPC) PAC, which Jayapal serves as the chairwoman, recently endorsed Brown in a hotly contested race for Ohio’s 11th congressional district over former state senator Nina Turner, who has been one of the highest-profile progressive candidates in the country. Turner also served as a national co-chair for Senator Bernie Sanders’ 2020 presidential campaign.

This year’s primary will be a rematch between Brown and Turner, who created a proxy war within the Democratic Party less than a year ago as progressives, including Jayapal, pushed for Turner while establishments wanted to see Brown elected. Brown won by roughly six percent.

Despite previously endorsing Turner in the 2021 special election, Jayapal, alongside the CPC’s two other chairs, announced last Wednesday that the group would throw their support behind Brown among a list of candidates described as “progressive leaders that are fighting for working people in their communities and across the country.”

“Each and every one of them is working every day to take on corporate special interests, fight for economic and social justice, universal health care, climate action, and bold solutions to the urgent crises facing our country,” Jayapal said in a statement with Representatives Jamie Raskin and Mark Pocan.

Sarandon’s Monday tweet referred to the boost of support Brown recently received from DMFI PAC, a political action committee bankrolled by Stacy Schusterman, chair of the deepwater drilling company, Samson Energy. The fundraising was first reported by The Lever.

Schusterman’s donations to the group account for nearly 70 percent of the $2.9 million raised between January and March of this year. In last year’s special election, DMFI PAC spent $1.9 million promoting Brown.

Turner has been campaigning for a Green New Deal and pressing the Biden administration to ban fracking.

On the other hand, Brown, whose campaign website says she supports the “principles laid out in the Green New Deal,” is not among the 104 co-sponsors of the Congressional measure and has declined to co-sponsor some of the House Democrats’ other key climate legislation.

Evan Brown, CPC PAC’s executive director, told Newsweek that Shontel Brown joined the Caucus in January and that “Endorsements are put to the CPC PAC for consideration when the incumbent CPC member requests it, and the CPC PAC regularly endorses incumbent members who ask.”

He added that when a request is made, all members of CPC PAC vote on the endorsement.

The CPC PAC’s endorsement of Brown also drew criticisms from Briahna Joy Gray, who served as the national press secretary for Sanders’ 2020 presidential campaign.

“To much of the left, this decision is the latest in a long line of disappointments from Jayapal, who some are dismissing as a progressive leader all together,” Gray said on The Hill’s Rising.

Gray also suggested that progressive firebrands like Representatives Alexandria Ocasio-Cortez and Ilhan Omar may break from Jayapal and endorse Turner instead.

“It will be interesting to see which leftists signal support for Nina Turner over the next few days, and which remain silent in the wake of the CPC endorsement. Any word from the squad yet?” she tweeted.

Update 4/18/22 1:34 p.m. ET: This story was updated with comments from Evan Brown.