The Town of Oyster Bay has filed a six-figure lawsuit against a former town attorney who was a key witness in the corruption trial of former Nassau County Executive Ed Mangano and former Town Supervisor John Venditto.

Officials say the town filed a suit for more than $840,000 against Leonard Genova. They say it's an effort to hold Genova accountable for his admitted role in a loan guarantee scheme at the center of the federal corruption case that implicated Venditto and Mangano.

"I hope he is prosecuted and gets the same amount of time, if there is any jail time, associated that you or I would get," says Ernie Schizchi, of Oyster Bay.

Genova received criminal immunity for testifying in the Venditto-Mangano trial. 

The complaint filed Wednesday claims Genova, "Committed outrageous acts of gross incompetence, malpractice, malfeasance and gross negligence."

In the complaint, lawyers for the town say they've incurred millions of dollars in legal fees because of him.

Nicholas Gravante, Genova's attorney, called the complaint "vindictive and retaliatory." He says he and his client will mount an aggressive defense in court.