This story came out in the local paper a couple of days ago. Basically, the mall had a rule that you couldn’t talk to anyone about anything other than mall business, or they could remove you. There is no way that rule could pass constitutional muster...
The mall is a private business, and should have the constitutional right to decide who is allowed to be in the mall, and what they can do.
It’s like a “no solicitation” rule. Surely the mall has a right not to allow people to come into a store and beg people for money, just like you have a right to tell people to leave your front porch if they try to convert you to their religion.