Carl Icahn’s feud with former protégé imperils Navistar sale

Carl Icahn has been squabbling with a former protégé in negotiations to sell a truck-making giant — and investors fret that the tiff could land the deal in a ditch. The 84-year-old billionaire is squaring off against Mark Rachesky — a hard-charging financier who worked for him for six years in the 1990s — over…
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