Whole Foods employees are trying to unionize to fight for better benefits and improved corporate culture. The move comes one year after Amazon bought the grocery chain.

On Thursday, some current and former Whole Foods employees sent out an email to call employees nationwide to act. The initiative, named Whole Worker, states its goal as to “organize team members companywide on a global scale and collectively voice our concerns to Whole Foods Market and Amazon leadership,” according to the email Yahoo Finance reviewed. “We believe every team member deserves the opportunity to form a union of like-minded team members and push for greater compensation, benefits and profit sharing.”

Employees who received the email are invited to an anonymous chat group on Slack, where they can have “a safe and secure space to discuss our experiences working at Whole Foods”. Retail, Wholesale and Department Store Union (RWDSU) has been assisting their efforts.

Founders of Whole Worker say many of the management issues at Whole Foods date back before Amazon’s acquisition, but they have seen a further deterioration after Amazon brought its fast-moving and high-pressure style of management to the customer-centric grocer. Under Amazon, Whole Foods has been pushing centralization and taking away autonomy from regional stores.

While Amazon shares (AMZN) doubled in the past year, once soaring over $2,000 and ballooning into a $1 trillion company, some Whole Foods employees say they can’t benefit from the boom because they weren’t granted any shares. Prior to becoming a part of Amazon, Whole Foods employees with at least 6,000 actual service hours are eligible to receive stocks that could vest over the next four years, according to internal documents Yahoo Finance reviewed.

Amazon workers have been trying for years

Unions are not common among retailers nowadays, according to Peter Cappelli, a professor of management at The Wharton School. “Employers are very effective at keeping them out. One way they do that is that they don’t have a lot of full-time employees,” said Cappelli. “It’s difficult to get part-time employees to organize. They have a high turnover, so people don’t stay long enough to invest in starting a union.”

Whole Foods workers are not alone in wanting a union to represent their interest. Amazon workers in fulfillment centers have been pushing to organize for years, yet with little progress. Amazon has been persuading employees they don’t need a union at all-hands meetings, telling them the existing open-door policy would work just well to get their voice heard. John Burgett, a former employee in Indiana who quit in March, wrote on his blog the policy “offers the illusion of voice.”