there is a new sheriff in town
A new individual has come to power and will be making changes.
noun
(High Sheriff) An official of a shire or county office, responsible for carrying out court orders, law enforcement and other duties.
A judge in the sheriff court, the court of a county or sheriffdom.
A government official, usually responsible for law enforcement in their county and for administration of the county jail, sometimes an officer of the court, usually elected.
verb
To carry out the duties of a sheriff.
name
An English surname originating as an occupation.