Which entities should be contacted regarding any suspicious activities involving foreign visitors?

Contacting CI or security personnel is essential when dealing with suspicious activities involving foreign visitors because these individuals are trained to assess and respond to potential threats to national security. They are equipped with the expertise to investigate unusual behaviors or actions that could indicate espionage or other harmful activities.

CI or security personnel often have the tools and protocols in place to handle sensitive information and can coordinate with appropriate federal agencies if necessary. Their involvement ensures that any threat is managed effectively and that the safety and security of the organization and its personnel are prioritized.

While other entities such as the HR department or public relations team may play a role in addressing inquiries or managing communication, they do not possess the specific training or responsibility to handle security-related concerns. The event planning committee's focus is typically on logistics and organization, which makes them ill-equipped to deal with security threats. Therefore, involving trained security personnel is the most appropriate course of action in these situations.