You tell me who is corrupt.
Bernie's wife had big wonderful plans for Burlington College. She took a fancy salary and bought a wonderful campus they couldn't afford from a local Catholic institution and when her anticipated growth in enrollment didn't occur the college went bankrupt and the land ended up in the hands of a local developer who was a friend. Meanwhile, expected donations were exaggerated in the documents used to obtain the loan to buy the land in the first place. But we will probably never know because many of the relevant records disappeared in a suspicious fire.
The local Republicans put the FBI up to investigating this. My guess is that it was simply bad judgment but who knows?