Labor

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This photo from Thursday, Feb. 20, 2014, shows a monument to the boxer Joe Louis in Detroit. Detroit's emergency manager filed a plan Friday, Feb. 21, 2014, to restructure the city's $18 billion debt by making cuts to pensions and creditors while offering a blueprint for emerging from the largest municipal bankruptcy in U.S. history. (AP Photo/Carlos Osorio)

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University of Michigan provost Martha Pollack speaks with Tyrell Collier and Shayla Scales, both seniors and members of the Black Student Union, after a Board of Regents meeting Thursday, Feb. 20 at the Michigan Union in Ann Arbor, Mich. (AP Photo/The Ann Arbor News, Brianne Bowen)

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Members of By Any Means Necessary, a civil rights activist group, protest during a Board of Regents meeting Thursday, February 20 at the Michigan Union in Ann Arbor, Mich. (AP Photo/The Ann Arbor News, Brianne Bowen)

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Members of By Any Means Necessary, a civil rights activist group, protest during a Board of Regents meeting Thursday, Feb. 20 at the Michigan Union in Ann Arbor, Mich. (AP Photo/The Ann Arbor News, Brianne Bowen)

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University of Michigan Board of Regents member Shauna Ryder Diggs, center, and other members of the board listen during a meeting Thursday, February 20 at the Michigan Union in Ann Arbor, Mich. (AP Photo/The Ann Arbor News, Brianne Bowen)

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Georgia Department of Transportation workers and city of Conyers employees prepare materials for streets and highways at a salt barn in anticipation of winter weather recently in Conyers, Ga. Suppliers of road salt are in the driver's seat this winter because of its severity and can barely keep sufficient amounts in stock. (Associated Press)