A transfer to another location or reassignment to another role in the company can be a retaliatory action, as well. Punishing you by moving you to a less suitable location or into a role with more difficult job duties is a common form of retaliation. From what I see litigating these types of cases, employers often resort to transfers and reassignments to set an example. By making it clear what happens when you speak up, employers can deter future whistleblowing or behavior that they see as problematic.