Ruth Marcus, a longtime op-ed writer for the Washington Post, quit on Monday after, she said, her column criticizing owner Jeff Bezos was killed by publisher.

Ruth Marcus, a longtime columnist at The Post, said its publisher refused to run her critique of the new focus for the paper’s opinion section.

Ruth Marcus, who has been a columnist for The Washington Post for nearly 20 years, resigned today in what she said was a protest of the decision to kill a piece critical of owner Jeff Bezos’ overhaul of the opinion section.