Businesses often sue on non-compete agreements. Usually at the beginning of employment, a key person in their company would have signed a non-compete agreement, meaning they would not go and work for a competitor. Somebody who violated that would have left the company, and most of the time these agreements would be in place because their key person or their key employee would have access to customer lists, internal systems, trade secrets and confidential information that they could use against that company by switching sides.
A lot of the litigation I have seen over at least the last couple of years has been about non-compete agreements and enforcing those by making sure people kept the confidentiality of any information they had and that they did not directly compete with my client.
If you need help with a lawsuit, you should call a competent attorney to help you. Call 801-676-5506 for your free initial consultation.