Most if not all counties in VA have a leash law. If the dogs are not directly supervised by their owners or used for hunting purposes they must be on a leash. If you have a similar law in your neighborhood call the dog warden and have themtake the dogs to the pound.

If the owners don't claim the dogs within a certain time period the problem will be taken care of. If they do claim the dogs they will have to pay a fee to get them back. I bet after paying the fee a couple of times they will learn it is easier to keep them under control!