Writer Naomi Wolf attended a HuffPo event in NYC where Governor Andrew Cuomo was expected to attend, and which had attracted a group of Occupy Wall Street demonstrators who wanted to address the governor. Seeing the demonstrators penned up far away from the area where it would be lawful to protest, Wolf asked the police to clarify what the demonstrators should be allowed to do. Once the police had clarified that it would be legal for demonstrators to picket out front of the event, providing they didn't impede pedestrian traffic, she led a group of protesters back to the sidewalk. A "white shirt" (senior NYPD officer) told her she was breaking the law in doing so, and when she asked him to clarify how this was so, he had her arrested. The NYPD continue to insist that the public sidewalk out front of the event was off-limits, but have not, to date, produced the alleged permit that established this.

source:http://boingboing.net/2011/10/20/naomi-wolf-arrested-at-ows-event-for-violating-terms-of-an-imaginary-law.html

Kinda simple...cops should enforce the laws, not make up laws.