Tenement door-jamming twat

Some twat keeps jamming our stair door open with boulders - this is out onto quite a busy street near a park. Now that the council has mandated unlocked stair back doors onto close gardens, this means open access for anyone to wander into the shared back greens of our entire block. This really boils my piss. I remove the stones but they reappear. Does anyone know if I have any rights to go the council/cops over unsocial behaviour?