Contract disputes blight work at Ground Zero

Concrete workers at World Trade Centre on strike over non-renewal of their expired contracts
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Martin O'Sullivan, a member of Concrete Workers Union Local 18A, (L) and Joseph Enright, a member of Concrete Workers Union Local 6A, sit outside the World Trade Center construction area during a strike on August 2, 2011 in New York City (Getty Images)
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A concrete truck sits parked inside the World Trade Center construction area on August 2, 2011 in New York City. Construction on the 800,000-square-foot transmit hub at the World Trade Center reportedly stopped when concrete workers from local unions went on strike on August 1, 2011 in protest of a contract that expired on June 30, and has yet to be renewed (Getty Images)
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Concrete workers also walked off the job at One World Trade Center, with minimal affect so far. Construction continued in other areas of the World Trade Center, though it was unclear how construction could be affected if the strike continues (Getty Images)
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Construction workers sit outside the World Trade Center construction area on August 2, 2011 in New York City (Getty Images)
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Concrete trucks sit inside the World Trade Center construction area on August 2, 2011 in New York City (Getty Images)
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Sean Geraghty (C), a member of Concrete Workers Union Local 18A, stands outside the World Trade Center construction area during a strike on August 2, 2011 in New York City. Construction continued in other areas of the World Trade Center, though it was unclear how construction could be affected if the strike continues (Getty Images)
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Mike Lyne, a member of Concrete Workers Union Local 18A, sits outside the World Trade Center construction area during a strike on August 2, 2011 in New York City (Getty Images)
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John Sadowski, a member of Concrete Workers Union Local 6A, stands outside the World Trade Center construction area during a strike on August 2, 2011 in New York City (Getty Images)