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I am sorry to hear about this situation. An employer is not allowed to discriminate or retaliate against an employee if the employee files a rightful employment-related claim such as a wage claim, sexual harassment claim, etc. This is called the public policy exception.
As such, if the retaliation is very bad, someone in your situation actually have a legal claim against the employer for said retaliation. However:
-it has to be linked to the complaint, and
-it has to be bad enough where a reasonable person would consider it harassment.
While you can do whatever you want to, understand that if the employee quits, this can play into the hands of the employer because they can claim that the employee quit voluntarily, etc.
What someone in your situation wants to do is to keep track of all the incidents of retaliation and then speak with an attorney face to face to discuss a possible legal action under the public policy doctrine.
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