White and yellow horizontal Local 509 logo
Join

Triangle

Sector:

Private Sector Human Services

Employer:

Triangle, Inc.
07/01/2022

–

06/30/2025
Download
Black horizontal Local 509 logo

Union Headquarters, 293 Boston Post Road West, 4th Floor Marlborough, MA 01752

Facebook X-twitter Instagram Bluesky Icon Bluesky Streamline Icon: https://streamlinehq.comBluesky

Our Union

Get Involved

For Members

© 2025 SEIU Local 509 All Rights Reserved.