Sen. Bernie Sanders targeted Amazon CEO Jeff Bezos during a hearing on wealth inequality and called up one of his employees who is trying to unionize to testify.

During the Wednesday hearing before the Senate Budget Committee, which Sanders chairs, he made a point of stressing that Bezos did not show up to the event despite being invited. The Vermont socialist highlighted one of the billionaire’s employees at the company’s Bessemer, Alabama, fulfillment center who is working with her co-workers for unionization.