The phrase "a case of fraud" is correct and usable in written English.
It can be used when referring to a specific instance or situation where fraudulent activity has occurred.
Example: "The investigation revealed a case of fraud involving the misappropriation of funds."
Alternatives: "an instance of fraud" or "a situation of fraud".
"This is a case of fraud," Ms. Johnson said.
"The French authorities are saying they are viewing the issue as a case of fraud rather than food safety.
Mr Mubarak's sons also were acquitted the public prosecutor inexplicably charged them over a case of fraud that was beyond the statute of limitations.
In his ruling, which ran to 600 pages, Mr Justice Cresswell said there was insufficient evidence to prove that Lloyd's actions amounted to a case of fraud.
Meanwhile, legal action over the horse meat scandal is to be mounted in Europe, Environment Secretary Owen Paterson has said as he described the contamination of beef products as a case of fraud against the public.
"This is a case of fraud and a conspiracy against the public, this is a criminal action, substituting one material for another," he told BBC Breakfast in answer to questioning about calls for a ban on meat imports.
While voter fraud is vanishingly rare, Republicans in Colorado may have a case of election fraud that they could point to, if they want to argue that signature-collecting and verification processes in the state should be tightened.
"We must make the careful determination of whether we are dealing with a case of outright fraud and violation of existing securities laws," he said.
Set in the early 1990s, he plays Mark Whitacre, who became the highest-ranking executive in US history to blow the whistle in a case of corporate fraud.
A Central Asian alchemist invents modern science after losing his right hand in what can only be called a case of experimental fraud.
The subpoenas suggest that prosecutors had decided to move forward with an inquiry that they believe could be a case of mail fraud.
