Depending on where she is, she may be covered by “pay secrecy” laws that prohibit retaliation for…

I was going to say that most employees are covered by that through the National Labor Rights Act, but that link specifies that it only covers non-supervisory employees and if she’s a principal in her firm she may have supervisor status. But I think both the NLRA and other related laws usually specify that you can talk about your salary (not the salaries of coworkers you come across in the normal course of business) — so the other employee who disclosed the salaries of the other principals may still have been in violation.

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