SEIU Local 1 Data Breach Exposes Sensitive Worker Information SEIU Local 1, a branch of the Service Employees International Union representing property service workers across six states, confirmed a data breach after detecting unauthorized access to an employee email account. The incident, discovered on March 27, 2025, involved suspicious activity traced back to two separate intrusions on March 4 and March 27, 2025. An investigation revealed that exposed data may include names, dates of birth, Social Security numbers, and financial information. SEIU Local 1, headquartered in Chicago, has stated that affected individuals will be notified by mail once the review is complete and contact details are verified. The breach impacts workers in 11 cities, primarily janitors, security guards, and food service employees. While the organization has secured its systems, the full scope of the exposure remains under review. Law firm Shamis & Gentile P.A. is investigating potential compensation for those affected.