A federal investigation into a waste treatment contract approved by the Detroit City Council late last year focuses on four council members as well as staffers, city employees, and people outside city governments, according to the Detroit Free Press, which broke the story of the probe last week.

Last November the council approved by a vote of 5 to 4 a controversial contract that would give Houston-based Synagro Technologies Inc. $47 million a year to process some of Detroit’s sewage waste into fertilizer and incinerate the rest. As part of the deal, the city’s aging incinerators were replaced. Union workers and environmentalists both opposed the deal.

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