Final answer:
An Emergency Action Plan (EAP) or a safety communication protocol is the management tool that identifies who employees should notify in case of a threat to guest or employee safety.
Step-by-step explanation:
The management tool that identifies who employees should notify in case of a threat to guest or employee safety is often referred to as an Emergency Action Plan (EAP) or a similar safety communication protocol. This tool will typically outline the chain of command and provide specific instructions on who to contact, which may include immediate supervisors, security personnel, or emergency services. Such protocols are essential in maintaining a safe work environment, particularly in response to warning signs such as intimidating behavior, threats, or any radical changes in a coworker's behavior as outlined by the Occupational Safety & Health Administration (OSHA).