The phrase "a successful espionage" is not correct in English.
The term "espionage" is an uncountable noun, so it should not be preceded by "a."
Example: "The agency conducted successful espionage operations during the Cold War."
Alternatives: "successful espionage activities" or "successful espionage efforts."
Although the origin and intent of this virus remain unknown, with military analysts positing that it may be typical malware rather than a successful espionage bid, the incident provides the media with a practical opportunity to finally start examining the processes that determine our republic's ability to protect itself from foreign cyber threats.
Groves wrapped the Manhattan Project in security but failed to prevent the Union of Soviet Socialist Republics from conducting a successful espionage program that stole some of its most important secrets.
The Manhattan District organized its own counterintelligence which gradually grew in size and scope, but strict security measures failed to prevent the Soviets from conducting a successful espionage program that stole some of its most important secrets.
As a former KGB man, Putin must be proud of what is surely the most successful espionage operation in history, one that succeeded beyond even Moscow's expectations – installing an admirer and sycophant in the White House.
Wise is this country's most successful espionage investigator.
In the 1950's, his operatives dug a tunnel into East Berlin to tap a communications line used by the Soviet forces, one of the cold war's most successful espionage achievements.
Orlov was the eminence grise of the Cambridge network--Philby, Burgess, Maclean, Blunt and others yet unexposed--one of Moscow's most successful espionage rings.
The result is a sharp, superbly acted feast for fans of the espionage genre, a successful recapitulation of an immensely complicated story that (gasp!) respects the intelligence of its audience.
"Information provided by this person was instrumental in the identification and disruption of several Cuban intelligence operatives in the United States and ultimately led to a series of successful federal espionage prosecutions," the agency added.
While there have been a number of prosecutions of government employees under the Espionage Act for leaking classified information, there has never been a successful prosecution of a journalist for receiving and publishing such information.
A successful business executive.
