The woman protested, claiming 40% of gun show vendors across the country are considered hobbyists and not dealers.
She says the law states hobbyists don't need a federal license to sell guns, and are not required to give a background check before a sale.
The protester says she's not against guns, or private sales, but believes gun shows can be a magnet for trouble, and closing the loophole can save lives.
"I certainly think it would go a long way toward protecting the general public from people who are going to use guns in an inappropriate way, and I don't think it's going to keep anybody from recreational means," says Sarah Hochschwender, the protester.
For more information on the movement to close the gun show loophole, visit this website.