workplace folk hero
Term used to describe a person who is or was generally fearless in their committed demonstrations of questioning what is often oppressive authority.
She was a workplace folk hero who had some impressive write-ups, righteous confrontations, refusals to obey absurd rules, a foul mouth at the perfect times, occasional meltdowns and a talent for ferreting out avoidant bosses; she also possessed a colorful selection of anti-workplace socks that many found supportive and hilarious.