Any person who alone or in concert with others, and without proper authorization, refuses to leave any part of the chambers, galleries or offices of either house of the State Legislature or building in which such chambers, galleries or any such office is located, or within any room or building or upon the property of a building in which a legislative hearing or meeting is being conducted upon a lawful order of the police or a security officer to disperse, leave, or move to a designated area, shall be guilty of a misdemeanor.