NEW ORLEANS - A federal judge has unsealed several documents connected to two prominent figures in former New Orleans Mayor Ray Nagin's corruption case, revealing more details of a financial dispute involving the former government witnesses.

Local media outlets are reporting that New Orleans businessman Scott Sewell contends in the documents that he is a whistleblower who should be compensated for more than $5 million in losses he suffered at the hands of former business partner Frank Fradella.

Sewell's attorney, Timothy Meche, said federal officials are improperly shielding Fradella from repaying his fraud victims because Fradella provided key bribery testimony in Nagin's trial. U.S. District Judge Susie Morgan ordered several of the documents unsealed late last month.

Nagin was convicted in February 2014 of 20 federal corruption charges, and sentenced to 10 years in prison.