Greensboro, North Carolina has a rather shaky history when it comes to police-protester relations. The cops apparently couldn't decide who they disliked more in 1979 when a Kluxer/NeoNazi group went up against the Communist Worker's Party and stood back to observe while nine people were shot dead. But oh they're right on the ball when Dear Leader's tranquil soul might be disturbed:

...members [of The World Can't Wait NC] clashed with police during a downtown protest against President Bush in January. Seven protesters were arrested at the rally after they confronted plainclothes officers with the Criminal Intelligence Division who were photographing protesters and the license plates of cars. The protesters faced a variety of charges, including assaulting a public official, inciting a riot and carrying a concealed weapon.

So the ACLU has filed suit to find out just exactly what written guidelines are in place telling cops what to do in such circumstances. Turns out....there aren't any. The policy, it appears, is Make Shit Up As You Go Along.