Ben Cohen (left) and Jerry Greenfield, co-founders of Ben & Jerry’s, attend a Peace Day celebration on Sept. 21, 2009, in New York City. But in a public resignation letter posted online Tuesday, Greenfield said Ben & Jerry’s “has been silenced, sidelined for fear of upsetting those in power” by Unilever, the multinational corporation that bought Ben & Jerry’s in 2000. Ben & Jerry’s sued Unilever in March, accusing it of firing the Ben & Jerry’s CEO in retaliation for the company’s ongoing activism on social media. Jerry Greenfield and Ben Cohen, the founders of Ben & Jerry’s, pose in front of their “Cowmobile” in Burlington, Vt., on June 15, 1987. Let us be free and let us find a socially-aligned owner, so that Magnum can be Magnum and Ben & Jerry’s can be Ben & Jerry’s.’ “