Check IDs at the city limits.
Do not let anyone in that does not live there.
Check Id’s of anyone out and about within the city limits.
Anyone not living there gets escorted to said city limits.
Stops the importation of any rabble rousers.
This should have been implemented the day after people started to gather.
http://www.freerepublic.com/focus/f-news/3194768/posts?page=57#57