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Operation Plunder Dome was the codename of an undercover investigation by the United States Federal Bureau of Investigation into corruption within the government of the City of Providence, Rhode Island.
The operation first became public when the FBI executed a search warrant on Providence City Hall on April 28, 1999.
The investigations that followed ultimately led to the indictment and subsequent conviction on federal criminal charges against a number of city officials including the 2002 indictment of then-Mayor Vincent "Buddy" Cianci, Jr..