Final answer:
The union of nurses in a chain of long-term care homes will be most directly involved with negotiating working conditions, wages, and benefits for its members.
Step-by-step explanation:
The union of nurses in a chain of long-term care homes will be most directly involved with negotiating working conditions, wages, and benefits for its members. This is the primary work of a labor union in any profession, including nursing. They will negotiate with management to improve the quality of work environment, ensure fair compensation, and advocate for better benefits for the nurses.