A new report from the Democratic opposition research group American Bridge's Bridge Project describes the way Charles and David Koch, the influential conservative billionaires, put their vast resources into actions that exacerbated the impact of Hurricane Katrina and stalled the Gulf Coast’s recovery.

The report, released Thursday, highlights the Koch brothers' influence on the region before and after the storm, including constructing and operating pipelines that destroyed wetlands south of New Orleans and attempting to obstruct legislation that would have aided the recovery.

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