[1/2] Joseph Percoco (L), former aid to New York Governor Andrew M. Cuomo, walks out of the Manhattan Federal Courthouse in New York, September 22, 2016.
The court has limited prosecutors in a series of political corruption cases in recent years.
In overturning Ciminelli's guilty verdict, the justices said that theory of fraud, known as "right to control," is "inconsistent with the structure and history of the federal fraud statutes."
The Supreme Court, which has a conservative majority, increasingly has limited prosecutors in political corruption cases.
Reporting by Luc Cohen in New York; Editing by Will DunhamOur Standards: The Thomson Reuters Trust Principles.