You have the right to expect honest advice from your stock broker and from the companies of which you are purchasing stock. Laws exist to protect your interests.
Occasionally you may encounter problems with your investment accounts from fraudulent investment practices. This could include broker fraud or misrepresentation by the company whose stock you purchased. As a private investor you can choose to seek legal representation to reclaim your lost investment.
Depending on the type of fraud encounter your case may be resolved in state or federal court or through an independent regulator.