Former Employer shared with me another Former Employees Write-up notes and termination letter.

Former Employer shared with me another Former Employees Write-up notes and termination letter. Just wondering what can be done about this. To briefly explain, they were responding to ERD on what was done to 2 former employees and provided their confidential information. They were submitting that information to me & ERD officer on what was done to the other 2 employees, including myself. Do they realize the damage I could do with that information? I could post this information publicly, and damage the reputation of this former employee. What steps can be taken at this point if the former employee chooses to do something about this?

I did let both of them that I was in possession of that information.