Ground Digger Wasp nests

Hi, we live on Prospect Place and these disgusting-looking mounds of dirt appeared in our front garden. We poked one with a stick and a yellow-and-black striped insect flew out. A little online research seems to indicate that this means they are the nests of Ground Digger Wasps.

Anyone in the area had this problem? How did you get rid of them?

The wasps will attack when nests are threatened, so I'm concerned about that -- and the nests' proximity to our front door.

Thanks in advance.