Around here (northeast Ohio) we call them yellow Jackets. They are a type of wasp and will sting if provoked. They generally nest in the ground. Google yellow jacket wasps to confirm this what you have.
If you want to get rid of them you can use wasp and hornet spray (the kind that sprays a long stream) and saturate the nest openings from far away. Do it in the late evening or early morning when they are in the nest an not too active. Be prepared to run. The spray will knock down any wasps you hit directly, but may take several days to kill all the wasps.
HTH,
Paul