A variety of employees have gotten in trouble as a result of dealing with Management personel who were not identified as such, or who could not be identified by name.
Imagine a Manager or Supervisor who does bargaining unit work, but is "flying under false colors" and is not identiified as such.
Imagine being confronted by a bossy co-worker who you then tell to mind your own business (or worse), only to be disciplined or fired for insuboardination, because that was the new head of the building you just ignored or swore at.
Imagine speaking freely about confidential matters thinking you are amongst co-workers, only to realize you were talking to, or being overheard by, a member of Management.
Apparently Labor and Management thought it important enough to include these words in the National Master:
ARTICLE 20. EXAMINATION AND IDENTIFICATION FEES
Section 5. Identification
"Should the Employer find it necessary to require employees to carry or record full personal identification, such requirements shall be complied with by the employees. The cost of such personal identification shall be borne by the Employer.
All management personnel shall wear a nametag identifying them as supervision while on duty."