Sometimes employees will lose their job if they blew the whistle. Sometimes the employees have not legitimately blown the whistle, but they’re simply trying to protect themselves from their own actions of the business and they’re trying to come with something to get back at the employer.
Other times employees are legitimately objecting to activities of the employer that were unlawful. In that situation if the employee’s fired the employer could be liable for substantial damages to the employee, for firing the employee. For the employees loses. The employees attorney’s fees and cost.