This depends on what happened to the information. Did the employer lose it, was it taken as a result of negligence by the employer, has the information fallen into the hands of those who are using it?
Unless there is a union, or a contract of employment, employees are all employed “at will”. This means that, without a union or a contract of employment, a worker can be terminated for any reason, or no reason, by an employer as long as they are not discriminating based on race, gender, national origin, religious beliefs or against another suspect classification, or unless the termination violates public policy. A public policy violation would include termination where the employee was voting or going for jury duty.
This answer is provided for informational purposes only. Actual legal advice can only be provided in an office consultation by an attorney licensed in your jurisdiction, with experience in the area of law in which your concern lies.