Do raised voices raise legal concerns?

Q: “I need a legal perspective when it comes to yelling at subordinates. What laws, if any, allow someone in management to raise their voice out of frustration? How do courts view a subordinate’s actions when they raise their voice back in response? Can it be used as grounds for discipline, i.e. writing someone up for verbally attacking a manager, or unprofessional conduct by subordinate? Last but not least, what about a subordinate who has suffered prior verbal abuse (mental trauma) during childhood or thereafter, and made comments alleging this?” – Anonymous, Virginia