Make nonworkers not visible

Summary:

Is it possible to hide the ability to search the nonworkers for all users and make them visible only to specific super users?

Content (please ensure you mask any confidential information):

Hello,

One of our clients would like to add some nonworkers, making them searchable only by super users. For example, a regular HR user should not be able to search for nonworkers in the directory or in the dropdown menus on any page of the system, while a super user should be able to do so.

Is it possible to hide the ability to search the nonworkers for all users and make them visible only to specific super users?