Did your Lawyer make a mistake? We have over 20 years experience representing victims of Legal Malpractice.To sue someone in Massachusetts, you have to file a complaint with the clerk of the court. A complaint is not a specific form. Massachusetts Personal Injury and Legal Malpractice Lawyers. The Supreme Judicial Court held that certain legal malpractice claims may be "voluntarily assigned". If you feel your attorney isn't working in your best interests, you may be able to file a legal malpractice claim.