Labor

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** FILE ** In this Oct. 15, 2013 file photo, Chicago Mayor Rahm Emanuel speaks at a news conference in Chicago. (AP Photo/M. Spencer Green, File)

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Newly hired Wake Forest head basketball coach Danny Manning, right, is greeted as he arrives at Smith-Reynolds Airport in Winston-Salem, N.C., Tuesday, April 8, 2014. (AP Photo/Chuck Burton)

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Newly hired Wake Forest head basketball coach Danny Manning, right, greets supporters as he arrives at Smith-Reynolds Airport in Winston-Salem, N.C., Tuesday, April 8, 2014. (AP Photo/Chuck Burton)

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Construction workers gather listening to a safety talk by a manager in front of Union Station, which is undergoing an extensive renovation and expansion, in Denver, on Monday, April 8, 2014. After laying off two million workers during the recession, the construction industry now fears it may not have enough crews to keep up with demand for building projects. On April 8, 2014 in Denver, the Associated General Contractors of America announced a plan to deal with the shortage, including establishing charter schools focused on technical training, starting non-union apprenticeship programs and calling on Congress to pass immigration reform. (AP Photo/Brennan Linsley)

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Construction workers Ryan Bell, left, and Shawna Smith, both electricians with the International Brotherhood of Electrical Workers Union, prep wire for installing at Union Station, which is undergoing an extensive renovation and expansion, in Denver, on Monday, April 8, 2014. After laying off two million workers during the recession, the construction industry now fears it may not have enough crews to keep up with demand for building projects. On April 8, 2014 in Denver, the Associated General Contractors of America announced a plan to deal with the shortage, including establishing charter schools focused on technical training, starting non-union apprenticeship programs and calling on Congress to pass immigration reform. (AP Photo/Brennan Linsley)

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Striking workers stand in front the entrance of the Olympic Park, the main cluster of venues under construction for the 2016 Summer Olympic Games, in Rio de Janeiro, Brazil, Tuesday, April 8, 2014. The labor dispute centers around which union represents the construction workers, and also involves benefits and working conditions. (AP Photo/Silvia Izquierdo)