Caroline Ellison, federal prosecutors’ star witness against former cryptocurrency mogul Sam Bankman-Fried, is expected to take the stand Tuesday to provide potentially make-or-break testimony in the week-old criminal trial. Get a curated selection of 10 of our best stories in your inbox every weekend.ArrowRight As the chief executive of Bankman-Fried’s hedge fund and his sometimes-romantic partner, Ellison played an integral role in his crypto empire and is set to provide jurors an insider’s view of what government lawyers call one of the biggest financial frauds in history.