Would the existence of an organization need to be kept secret while it is doing valuable work ?

Question by workplace psychopath: Would the existence of an organization need to be kept secret while it is doing valuable work ?
Otherwise won't assorted spivs attempt to visit the organization, unintentionally or intentionally derailing the work ?

"Only the Paranoid Survive: Book Preface (Andy Grove - Intel)
Sooner or later, something fundamental in your business world will change.

I'm often credited with the motto, "Only the paranoid survive." I have no idea when I first said this, but

Time and Attendance Management more ...