11 of 20: Police officers surround a bloodied demonstrator after his arrest during an un-permitted march, Tuesday, May 1, 2012 in New York. Hundreds of activists with a variety of causes spread out over New York City Tuesday on International Workers Day, or May Day, with Occupy Wall Street members leading a charge against financial institutions. (AP Photo/Mary Altaffer) (AP Photo/ Mary Altaffer)

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