breach of contract,
misappropriation of trade secrets
unfair trade practices
Here are a few more juicy tort claims you can use.
harm to reputation
From yet another article I gleaned these claims:
breach of the written contract
breach of written release agreement
breach of the duty of loyalty
breach of fiduciary duty
intentional infliction of emotional distress
negligent affliction of emotional distress
abuse of process
So there you have it. Be sure to add "under state and federal law" to your list of usurpations. Just pepper your complaint letters with these key phrases and you sould got a nice rise out of the recipient. You might even hook a couple of their lawyers.