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 stemming from FTX’s implosion. But at a hearing on Friday, Judge Lewis A. Kaplan of Federal District Court in Manhattan said that arrangement would have to end, after prosecutors argued that Mr. Bankman-Fried had twice tried to interfere with witnesses in the case, including by giving documents to reporters.

“He has gone up to the line over and over again, and I am going to revoke bail,” Judge Kaplan said from the bench.

After the order was read aloud, two U.S. marshals had Mr. Bankman-Fried remove his tie and navy suit jacket as they prepared to handcuff him. His mother, Barbara Fried, in attendance with his father, tried to approach him, but a court officer cautioned her to stand back. He was taken to the Metropolitan Detention Center in Brooklyn.