Sam Bankman-Fried is no longer allowed to contact FTX and Alameda employees or use encrypted communications, U.S. District Judge Lewis Kaplan ordered Wednesday.

The restriction was put into place following claims made Friday that the disgraced crypto mogul had contacted a potential witness earlier this month via the encrypted messaging platform Signal, seeking to establish a more favorable relationship.

Federal prosecutors had said the conduct of Bankman-Fried may amount to “witness tampering” when he reached out to “the current General Counsel of FTX US”—a person with close knowledge of his conduct leading up to the collapse of FTX in November of last year but listed in a recent filing on as “Wittness-1.”