Go read the many, many examples:
Now, a new strategy is being deployed to yank the rug from under occupations in four cities: legal power. Politicians have recently passed laws in Honolulu and Charlotte, N.C., that with a stroke of the pen made the occupations illegal, enabling police to sweep them away. Two more occupations, in Boise, Idaho, and Nashville, may be nearing the end as their respective state legislatures are on the verge of outlawing the democratic villages that for months have been thriving next to edifices of power. Critics charge that the anti-Occupy laws reveal how the law is not an objective code that treats everyone equally, but an arbitrary weapon wielded by the powerful.
utah philips has a great story abouyt what happened when Spokane did something like that.
eventually the jails were full. and now the city had to pay for to feed all the incarcerated people. I think the law was repealed within a year, too expensive.