A Guide to the Massachusetts Collective Bargaining Law (Guide) is a publication of the. Massachusetts Department of Labor Relations (DLR).Section 5.3 of the Collective Bargaining Agreement shall be amended for employees hired after June. Click here to fill out the CSEA Membership application online! Stay connected with our union. Seniority is the right accruing to employees of the Authority whose jobs are listed in the Agreement, through length of service, which entitles.