May Day

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FILE -- In this May 1, 2013, file photo, protesters react as a police flash-bang grenade goes off during a May Day march that began as an anti-capitalism protest and turned into demonstrators clashing with police in downtown Seattle. May Day has turned violent recently in Seattle, where last year police arrested 18 people from a crowd that pelted them with rocks and bottles. A year earlier masked marchers dressed in black broke windows and doors on downtown banks and stores and tried to set a fire at a federal building. (AP Photo/Ted S. Warren, File)

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A protester walks away after placing a smoke device on the ground in front of police officers during a May Day march that began as an anti-capitalism protest and turned into demonstrators clashing with police on Wednesday, May 1, 2013, in downtown Seattle. (AP Photo/Ted S. Warren)

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Thousands of people march during a May Day immigration rally in Los Angeles on Wednesday. The Senate is crafting an immigration reform bill. (Associated Press photographs)

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Martina Cano joins others in a May Day march for immigration reform in Grand Rapids, Mich.

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A demonstrator holds up a portrait to make fun of German Chancellor Angela Merkel, now-defeated French President Nicolas Sarkozy (center) and Spanish Employers Organization President Juan Rosell during a May Day protest Tuesday in Pamplona against the Spanish government's tough new labor reforms and cutbacks. (Associated Press)

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Jesse Morgan (left) looks on during a May Day rally in Atlanta on May 1, 2012. While a black preacher told a crowd of about 100 immigration activists that incarcerated blacks and detained illegal immigrants faced similar challenges, Morgan stood to one side of the May Day protesters holding a large sign that read "Radical Queers Resist." (Associated Press)

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Occupy protesters unveil a banner Tuesday in New York's Bryant Park as part of worldwide May Day demonstrations. They went on to march to financial institutions, including Chase and Citibank, as the crowd grew to several hundred. (Associated Press)