It’s the melting pot of all scams. Russian gangsters, MS-13 members, and a cadre of corrupt surgeons, lawyers and lenders are pulling off the latest big con in the city: bogus personal-injury lawsuits where immigrants go under the knife to help their twisted ruse. Migrants and other desperate New Yorkers are pressured into getting unneeded spinal fusion surgery and other operations to boost the value of their fake-accident claims, according to court records, insurance investigators and law-enforcement sources. Doctors cash in on the sick swindle by performing back and neck fusions, allowing fraudsters to swipe billions through bogus insurance filings, according to court filings and sources. The racket typically...