Massachusetts does not have a legal definition for fulltime or parttime employees. Laws, regulations, and web sources on hours and conditions of employment law.This state-specific guide covers labor and employment case law, statutes, rules, and regulations that HR professionals and clients often encounter Four laws to closely consider include the FMLA, the ACA, the SNLA, and the Domestic Violence Leave Act. This Massachusetts employment law overview reviews requirements employers should know if they have employees working in the state. As an employer in Massachusetts, it's crucial to navigate both state regulations and federal laws to ensure your business stays in compliance. Discover your rights and your employer's duties under Massachusetts Labor Law with this comprehensive guide. Four laws come into play when MA employers reach this threshold: COBRA, ADEA, OWBPA, and the MA Personnel Record Law. Employment Law Business Guide. Massachusetts has 9 individual labor law notices that all businesses large and small are required to post in the workplace.