loiter
v. to linger or hang around in a public place or business where one has no particular or legal purpose. In many states, cities, and towns there are statutes or ordinances against loitering by which the police can arrest someone who refuses to "move along." There is a question as to whether such laws are constitutional. However, there is often another criminal statute or ordinance which can be applied specifically to control aggressive begging, soliciting prostitution, drug dealing, blocking entries to stores, public drunkenness, or being a public nuisance.

loiter verb be idle, be vagrant, cessare, hang around, idle, linger, move aimlessly, pass time in idleness, poke, stand around, tarry, wander aimlessly
Associated concepts: vagrancy