More than 450 alleged fraudsters — including 90 doctors and medical professionals — were busted for bilking at least $6.5 billion in fake Medicare and Medicaid claims , with one greedy nurse splashing her ill-gotten gains on an $865,000 Bulgari necklace, $594,000 Ferrari and a $4.6 million Philippines beach resort, authorities said. The colossal crackdown, which spanned 45 US states and territories, was announced Tuesday by Acting Attorney General Todd Blanche, who called it “the greatest