I would have thought that if you actually stop them and ask them to explain exactly what they are doing and why, that might shake them up somewhat. If they have no viable answer then ask for their names and addresses and tell them you intend to call the police because you believe they are casing the area for nefarious reasons. You could also pull out your phone and start dialing.
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A people free to choose will always choose peace. 
Law of Logical Argument: Anything is possible if you don't know what you are talking about!
Since light travels faster than sound, some people appear bright until you hear them speak
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