Documents released by the FBI show that a source told investigators that an Alaska congressman and his late wife spent campaign money on hunting trips and flights and wrote checks to themselves over years of allegedly profligate spending on his contributors' dime.
Don Young and the matter was dropped in 2010.
The documents were released Friday, more than three months after a federal judge rejected the Justice Department's refusal to turn over records of its criminal investigation. The source's name was redacted in the documents.
Congress asked the Justice Department in 2008 to investigate Young's role in securing a $10 million earmark to widen a Florida highway.
The project would have benefited a developer who helped raise money for Young. The congressman was re-elected to a 20th term in 2010.