Walton Heir Vows No Tolerance for Violations Wal-Mart Stores Inc. Chairman Robson Walton, son of founder Sam Walton, is pledging to shareholders at the company's annual meeting that it will not tolerate violations of any kind and will get to the bottom of the allegations of bribery in Mexico. The address comes as the world's largest retailer is using the annual event to celebrate its 50th anniversary of the company. Some shareholders have called for the removal of several board members, including Walton, CEO Mike Duke and former CEO Lee Scott. Investors have filed lawsuits against top executives. The descendants of founder Sam Walton own about 50 percent of Wal-Mart's shares, so activist shareholders have little chance of voting out the board members. But any lack of support for the leaders is a blow to the retailer.