6 of 29: Demonstrators protest in front of the Obelisk monument in Buenos Aires, Argentina, Thursday Oct. 21, 2010. A strike and the rally were called in protests to the death of 23-year old Mariano Ferreyra, who was shot in the chest and killed Wednesday during a violent confrontation between railroad workers and members of the leftist Worker's Party, or Partido Obrero.(AP Photo/Natacha Pisarenko) (AP Photo/ Natacha Pisarenko)

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