Bill Talen was arrested on harassment charges last week while reciting the First Amendment through a megaphone in Manhattan's Union SquareThe NYPD has aggressively policed the rides, arguing that they can interfere with traffic and threaten public safety. Advocates for Critical Mass have accused police of infringing on the riders' constitutional rights to free speech and free assembly.The video shows Talen preaching the "44 beautiful words of the First Amendment" to a visibly annoyed congregation of police commanders huddled a few feet away. At one point, an officer approaches and warns him that his sermon is breaking the law."What's the law?" Talen asks."Harassment," the officer answers.When Talen persists, another officer comes up behind him and slaps on handcuffs. When being put in a police van, the satirist shouts, "We have a right to peaceful assembly!"Talen was held overnight before being released without bail. A criminal complaint alleges he harassed police officers by approaching them and "repeatedly shouting at such officers through a non-electric bullhorn."

I think that the police had no reason to aresst bill because he did not violate anything. he had the right to peacefull assembly and free speech. Bill did not even harasse the police man.
http://www.washingtonpost.com/wp-dyn/content/article/2007/07/02/AR2007070201876.html?sub=new