Ben & Jerry’s co-founder Jerry Greenfield is leaving the ice cream brand after 47 years, saying that the independence it once had to speak up on social issues has been stifled by its parent company Unilever.

In a letter, which co-founder Ben Cohen posted on social media on Greenfield’s behalf, Greenfield said he could not “in good conscience” remain at Ben & Jerry’s — citing a loss of independence to Unilever, which he said had once agreed to give Ben & Jerry’s autonomy around its social mission when it acquired the brand more than two decades ago.

“For more than 20 years under their ownership, Ben & Jerry’s stood up and spoke out in support of peace, justice and human rights, not as abstract concepts, but in relation to real events happening in our world,” Greenfield wrote “It’s profoundly disappointing to come to the conclusion that that independence, the very basis of our sale to Unilever, is gone.”

Ben & Jerry’s, famous for its colorful ice cream containers with flavor names such as Cherry Garcia and Phish Food, has also long been known for its progressive political values — speaking out on a range of social issues over the years. And in his letter late Tuesday, Greenfield noted that the brand’s loss of independence arrived at time in the U.S. when the Trump administration “is attacking civil rights, voting rights, the rights of immigrants, women and the LGBTQ community.”

“Standing up for the values of justice, equity, and our shared humanity has never been more important, and yet Ben & Jerry’s has been silenced, sidelined for fear of upsetting those in power,” he wrote.

Tensions between Ben & Jerry’s and its parent have heightened in recent years — with the ice cream brand accusing Unilever of silencing its statements in support of Palestinians amid Israel’s war in Gaza, among other conflicts. And Greenfield’s departure also arrives as the consumer product giant, based in London, is spinning off its ice cream business into a stand-alone company called The Magnum Ice Cream Company.

In a statement on Wednesday, a spokesperson for Magnum said that it would be forever grateful to Greenfield for his contributions to Ben & Jerry’s and thanked him for his service, but was not aligned with his viewpoint.

“We disagree with his perspective and have sought to engage both co-founders in a constructive conversation on how to strengthen Ben & Jerry’s powerful

values-based position in the world,” the spokesperson said — adding that Magnum is still committed to Ben & Jerry’s mission and remains “focused on carrying forward the legacy of peace, love, and ice cream of this iconic, much-loved brand.”