Extrinsic fraud

Extrinsic fraud is fraud that induces one not to present a case in court or deprives one of the opportunity to be heard or is not involved in the actual issues. More broadly, it is defined as:
Extrinsic fraud often involves fraud on the court, but may arise in other contexts. Extrinsic fraud does not mean merely lying or perjury, nor misrepresentations, nor intrinsic fraud, nor "to matters that could have been raised during the divorce proceeding." It must involve "collateral ... circumstances" such as:
Examples.
Family law.
Extrinsic fraud may be claimed in family law and domestic relations cases. For example, paternity cases are sometimes the subject of extrinsic fraud; the classic case is when a man is encouraged to sign an acknowledgment that he is the father of a newborn baby, thus giving up his right to contest the matter in a filiation action.
In "Love v. Love", the Nevada Supreme Court ruled that extrinsic fraud had led the putative father to sign an admission against his interest, thus allowing the court to grant equitable relief to undo the fraud. It also may occur when a man fails to appear in court when a paternity suit is filed against him, thus resulting in a default judgment due to the fraud by his "paramour".
In such cases, there is a high burden of proof (typically moral certainty or beyond a reasonable doubt) of the petitioner to prove the intrinsic fraud, because of the state's interest "in the best interests of the child" to ensure that every child has a father. That is called paternity by estoppel, in which the putative father is actually prevented from proving he is "not" the father due to the high standard of evidence necessary as a matter of law.
Other examples.
Extrinsic fraud may occur in real estate transactions or financing, such as when a lender forces a homeowner to lose his or her real property in a foreclosure through acts of fraud. 
A lawyer who intentionally keeps information from his or her client about an upcoming hearing or trial could be held responsible for extrinsic fraud, as well as being subject to disciplinary action and a legal malpractice lawsuit.
It is at least theoretically possible for a court to enjoin a criminal proceeding, but unlikely. A "writ of habeas corpus" or "writ of error coram nobis" may be possible as well.
An activist in Berkeley, California sued the University of California over its long-term plan, for alleged extrinsic fraud.