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Was the letter supposed to be confidential and who shared it with the third party?
A communication from a third party to your company would not be a trade secret and would not be governed by the federal statute. You are dealing with an unfair trade practice or a breach of the duty of the employee to keep confidential matters related to the company that is confidential. This is governed by state law not federal law. Any claim would be under state statutes or an employee's common law duties to his or her employer.
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