@ Ann Since I would assume you at least assert a copyright on your material, a lawyer would be a good idea to see about legal action for copyright violation. Yes, the people doing this are probably internet scammers in Ghana but at least you can start some legal action although it won't go far until you can identify who those people actually are. Also, the FBI has been tasked with the job of dealing with issues of identity theft in the U.S. and under a broad interpretation of identity theft your situation would fit under that umbrella. I don't know what current FBI guidelines are for that but you might want to contact them and explain the situation. Maybe they will have some good ideas about what to do.