SEIU Local 509
SEIU Local 509 represents nearly 20,000 human service workers and educators throughout Massachusetts. We provide a variety of social services to elders, at-risk children and people with mental illnesses or developmental disabilities — as well as educational services in both public and private sector settings. From mental health clinicians and social workers to early childhood educators and university lecturers, Local 509 members are united in our mission to raise living standards for all working families while improving the quality and affordability of the services we provide. Local 509 is part of the 2.1 million-member Service Employees International Union, the fastest-growing labor union in the United States.