A protester affiliated with Occupy Wall Street holds a sign fashioned as a birthday cake on September 17, 2012, in New York City, the one year anniversary of the movement.

Protesters are arrested during Occupy Wall Street demonstrations on September 17, 2012, in New York City. The movement, which sparked international protests and sympathy for its critique of the global financial crisis, is commemorating the first anniversary of its earliest protest. The main protest began in front of the New York Stock Exchange and was preceded by a series of days where free courses were offered on such topics as Marxism, anarchism, education and finance.

People listen to an Occupy Wall Street anniversary concert in Foley Square in New York on Sunday, Sept. 16, 2012. The Occupy Wall Street movement will mark its first anniversary on Monday.

Occupy Wall Street protesters leave Washington Square Park at the start of their Saturday march to Zuccotti Park, the first planned march as part of three days of events to mark the one year anniversary of the movement.

NYPD officers on foot and motorbikes shadowed the Occupy protesters on their way down Broadway to Zuccotti Park on Saturday September 15.

A police officer gives orders to Occupy Wall Street protesters during a march from Washington Square Park to the Financial District, in New York, September 15, 2012.