Fraud on the court occurs when the judicial machinery itself has been tainted, such as when an attorney, who is an officer of the court, is involved in the perpetration of a fraud or makes material misrepresentations to the court. Fraud upon the court makes void the orders and judgments of that court.
In Bulloch v. United States, 763 F.2d 1115, 1121 (10th Cir. 1985), the court stated "Fraud upon the court is fraud which is directed to the judicial machinery itself and is not fraud between the parties or fraudulent documents, false statements or perjury. ... It is where the court or a member is corrupted or influenced or influence is attempted or where the judge has not performed his judicial function --- thus where the impartial functions of the court have been directly corrupted."