"reign of fear" is correct and usable in written English.
You can use it to refer to a period of time in which there is a lot of fear or dread due to a certain individual or group in power. For example: "The tyrant's reign of fear came to an end when the people finally overthrew him."
The reign of fear has been broken.
There are a number of useful, if ugly, lessons to be learned by examining four decades of repression in Myanmar -- a reign of fear, poverty and isolation that, so far, shows no signs of coming to an end.
He presided over a reign of fear and violence inside Somalia for several years, organizing the stoning of teenage girls and crude public amputations, all part of an effort to return Somalia to the Shabab's vision of strict Islamic rule.
"Quiet" is a word that, long before the end of Penn's finely detailed narrative, comes to chill the reader, summoning up images from a reign of fear in which money, estates, possessions and titles were transferred into the Tudors' coffers under an efficient, discreet and brutal system that left room only for mute assent.
A vote held on Tuesday, with Mr. Hussein as the only contestant, was stage-managed as a means of answering President Bush's descriptions of Mr. Hussein as a murdering dictator, and as a man who has imposed a reign of fear and terror on his own people and his region.
Mr. Bush tried to show optimism this morning, when he traveled to the Pentagon for a briefing, but he cautioned: "We're fighting an enemy that knows no rules of law, that will wear civilian uniforms, that is willing to kill in order to continue the reign of fear of Saddam Hussein".
The reign of mental fear and terror here was continuous for four days and Malinski's will was in a shattered state on the occasion of making each confession.
The fantasy of one of them is that he is justified in his role as the "supreme leader" of a military reign of totalitarian fear over nearly 25 million people.
King Henry IV moved his government temporarily to St Albans early in his reign for fear of public opinion in London.
If other nations assert the same right then the rule of law will quickly be replaced by the reign of fear..
His antipathy to the Girondins may have caused the leaders of the Reign of Terror to fear him as a potential leader of the sansculottes (lowest classes).
