市场消息：星巴克投资者团体准备就劳动关系倒退问题与董事会展开斗争。

Group 1 - The core issue revolves around a labor relations regression that has prompted a group of Starbucks investors to prepare for a confrontation with the board of directors [1] Group 2 - The investor group is focused on addressing concerns related to labor practices and employee relations within the company [1] - This development indicates potential challenges for Starbucks in maintaining positive labor relations amidst investor scrutiny [1] - The situation may impact the company's reputation and operational dynamics if not addressed effectively [1]