DearCustomer- This would certainly be grounds for dismissal in any employer/employee relationship as it would be a breach of fiduciary duty by the employee. It wouldn't be a violation of law in any criminal sense but if there was an employment agreement prohibiting this there could be some civil damages.
If the employee actually took business away from the employer while still in the employ of that company then there would cause for damages. To answer your question it is not "OK" to do this but, depending on the circumstances, the consequences can be different.
I can't speak for another attorney since it would be their choice. The damages would be for the loss of the business caused by these actions. Depending on the strength of the case and the likelihood of success and amount of damages an attorney may take this on a contingency basis.
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