Looking at the MOA website there's no indication of a fencing club. Looking at the list of tenants, no tenant has the words (strings actually) "fencing" or "sword" in its name. Fat Tuesday's is no longer listed in this list either (although Ruby Tuesday is). A general google search for "fencing mall of america" didn't come up with anything useful.
Clearly it IS possible to have a club in a mall. A (sort of) local club here was looking at mall spaces before they found their current site. As to being a chain, you mean like (MOA tenant) sleepyheads.com, right?
-B
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"Oh but you can't expect to wield supreme executive power just because some watery tart threw a sword at you!"