I’d be interested to read this:
https://www.nhlpa.com/the-pa/certified-agents?range=G-H
Only player agents certified by the National Hockey League Players' Association are permitted to represent players in their dealings with NHL clubs. The NHLPA regulates the conduct of player agents under its Regulations Governing Agent Certification. The Agent Regulations set out the various terms under which agent duties must be performed, and include standards of conduct with which agents must comply. The NHLPA has the power to suspend, restrict, or terminate the certification of any agent for violation of these Agent Regulations.