OK,So my crew and I got kicked off Target and Wal-marts parking lot for shooting "man on the street" videos. We had the participants all sign a waiver, but not the property owners. All we did was ask questions, nothing else, and it didn't relate to the property at all. They just happen to have a lot of people coming and going.
What are our rights to do this kind of thing, what permission/forms etc do we need, and can they legally make us leave if we are gathering info under FAIR USE act?
It's private property, so yes, they can make you leave.
That's a separate issue than showing the store's sign or identifiable building design. That could also be problematic. From a pure legal standpoint you woudl need the corporation's permission for that too, unless it's "fair use" like a news story.
Actual "news" production has different rules. (which is a good thing for freedom of the press.) I admit that I've had disagreements with production folks that came from a news background over content rights issues more than once. I think this is because those who cut their teeth in the newsroom are used to being able to shoot with more or less impunity, while I saw the other side of the fence early because I started in corporate video before gonig into broadcast TV.
Your best bet is to do your "man on the street" interviews on public property, such as a city park.