Neighbors Using Cones to Reserve Parking on Public Street

At the risk of sounding like an elderly neighborhood crank, I've gotta ask: is there anything we can do?? New neighbors have been using two traffic cones every day to block of what they have deemed "their" parking spot on the street, making parking even more sparse than it usually is. They often do this for hours. Keep it mind, it is a non-permit required fully free to use public street and we are in a dense neighborhood. Besides just moving the cones every single time someone needs to park there, is there a business unit in Waltham that deals with absurdities like this or?