One of my senior housing accounts in West Windsor called to tell us there was a bald face hornets nest in a tree close to the parking lot where the residents parked. Bald face hornets are very aggressive and will attack without warning. This nest was very large, it probably took about 3-4 weeks to build. Anyone who crossed there flight path to the nest, any vibration like a car running or a landscaper cutting the lawn would cause them to attack.
With a bee suit, we treated and removed the nest to keep the residents safe.