Sam Bankman-Fried, the founder of the collapsed cryptocurrency exchange FTX, was sent to jail on Friday after a federal judge in New York revoked his bail, accusing him of trying to influence witnesses who are poised to testify against him at a widely anticipated trial in less than two months.
Mr. Bankman-Fried, 31, had been under house arrest at his parents’ home in Palo Alto, Calif., since he was arrested in December on fraud charges…