Assessed more than $15 million in workplace safety violations since 2017, low-cost retailer Dollar General and its board now face a shareholder lawsuit alleging breach of fiduciary duty and a waste of corporate assets.

The suit filed last month in U.S. District Court for the Middle District of Tennessee by shareholder Brent Conforti cites a “sustained failure of the Dollar General board members to implement and maintain an effective system of internal controls.”