A satirist dressed as a preacher and protesting what he called the Disneyfication of New York City was arrested Friday for harassing police in Union Square before the start of a monthly bicycle rally that the Bloomberg administration has been trying to rein in.

Bill Talen, who performs under the name Reverend Billy, said that he was arrested after trying to defend the cyclists' rights by reading the First Amendment to the police - through a bullhorn. The authorities said that he was arrested after repeatedly being told to stop.

Mr. Talen was charged with two counts of second-degree harassment. He was released without bail pending a court date in August.

"We were full of the holy spirit of the First Amendment," said Mr. Talen, who is in his mid-50s and was dressed like a big-tent evangelist, with a white suit and a dyed-blond pompadour. He sometimes spreads his message with the help of the Church of Stop-Shopping Gospel Choir.

In an interview yesterday, Mr. Talen defended his performance art. "New York City won't exist if we won't let creativity happen in public space," he said.

Mr. Talen said he was at Union Square to support the cyclists taking part in Critical Mass, a monthly ride aimed at promoting nonpolluting forms of transportation. Critical Mass riders gather the last Friday of every month at Union Square.