Before he was NYC mayor, he was the U.S. attorney who prosecuted the mafia in the "pizza connection" case
... Rudy Giuliani, 
who later became Mayor of New York City, was the United States Attorney for the
... [DOC] [TLE] 17 FOUND GUILTY IN 'PIZZA' TRIAL OF A DRUG RING - NYTimes ... [PAR] Mar 3, 1987 ... All 19 defendants were charged with participation in a Mafia ring ... Rudolph W. 
Giuliani, the chief Federal prosecutor in Manhattan, said vigorous prosecution of 
Mafia ... for more than three months to attack the prosecution's case.