As an attorney who works with Amazon sellers, I highly recommend Amazon Sellers Lawyers. For Sellers encountering major issues, this should be your first choice.
CJ has a great team. They are very responsive and knowledgeable. Initial consultations are free.
This review is based on my experience referring clients to Amazon Sellers Lawyers -- there are other options out there -- but Amazon Sellers Lawyers are the proven experts in the field. They will give you an honest assessment, highly recommended.