Without knowing more it's difficult to give you a full answer. However, is you knowly bring counterfeit goods from another country into the United States, you may have variety of significant legal issues. On the civil side, you may get sued by the company you are counterfeiting, under several theories including trademark infringement, unfair business practices, and more. You may be required to distroy the goods and to pay all profits made plus treble damages (three times the amount of damages) to the rightful trademark owner. I am not a criminal attorney, but you may also have criminal issues to contend with. In sum, it is typically not a good idea.