The F.B.I. searched the house of the cryptocurrency government Jesse Powell in March as a part of a felony investigation into claims that he hacked and cyber-stalked a nonprofit that he based, three individuals with data of the matter stated.

The investigation targeted on an allegation by the nonprofit that Mr. Powell, who additionally based the cryptocurrency change Kraken, had interfered with its pc accounts, blocking entry to emails and different messages, the individuals stated. Brokers with the F.B.I. and the U.S. lawyer’s workplace for the Northern District of California have been trying into Mr. Powell since at the least final fall, three individuals with data of the case stated.

Brokers searched Mr. Powell’s dwelling within the Brentwood neighborhood of Los Angeles and seized digital units, in accordance with an individual acquainted with the search and paperwork reviewed by The New York Occasions. Prosecutors haven’t accused Mr. Powell of any crimes.

Brandon Fox, a lawyer for Mr. Powell, confirmed that he was underneath investigation by federal prosecutors in Northern California. Mr. Fox stated the investigation was targeted on the allegations by the humanities group, Verge Heart for the Arts, and “under no circumstances associated to Mr. Powell’s employment or his conduct within the cryptocurrency area.” He additionally stated Mr. Powell “did nothing improper.”

A Kraken spokeswoman stated the Verge investigation had nothing to do with the corporate, and that Kraken had no purpose to imagine that prosecutors have been investigating different potential points.

An F.B.I. consultant declined to remark. A spokesman for the U.S. lawyer’s workplace for the Northern District of California declined to verify whether or not an investigation was underway.

In current months, federal investigators have cracked down on a number of of Kraken’s opponents. Sam Bankman-Fried, the founding father of the FTX crypto change, was charged with fraud final 12 months, whereas Coinbase and Binance, two of the biggest exchanges, face authorities lawsuits.

A key determine within the early historical past of crypto, Mr. Powell, 42, constructed Kraken into the second-largest U.S. crypto change behind Coinbase.

His firm has confronted years of authorized scrutiny. In current months, prosecutors have examined allegations in opposition to Kraken and Mr. Powell that have been made in a wrongful termination lawsuit filed in opposition to the corporate in 2019, two individuals acquainted with the probe stated. In that lawsuit, a former Kraken worker accused the agency of incomes income from accounts in international locations that have been underneath U.S. sanctions, and claimed Kraken’s financial institution accounts have been lacking hundreds of thousands of {dollars} of buyer deposits.

The go well with was settled in 2021, after a decide dismissed the worker’s declare that his firing was associated to the sanctions concern.

Final 12 months, Kraken paid a $360,000 wonderful to settle Treasury Division prices that it violated sanctions by permitting customers in Iran to commerce digital currencies. In February, Kraken paid a $30 million wonderful to the Securities and Alternate Fee for providing an funding product that the company stated violated securities legal guidelines.

Mr. Powell based Verge, the Sacramento arts group, in 2007. Final 12 months, the group eliminated him from its board of administrators, citing his failure to attend board conferences and violations of the group’s “guiding ideas,” in accordance with courtroom data. The removing happened after an article in The Occasions detailed Mr. Powell’s efforts to incite debates about race and gender that some Kraken staff discovered offensive.

After Mr. Powell’s dismissal, he blocked Verge from utilizing its web site, emails and inside messaging system, and improperly accessed confidential info saved in these accounts, in accordance with a letter that Verge’s lawyer, Phillip Cunningham, despatched to Kraken in November. The letter was reviewed by The Occasions.

Final month, Mr. Powell sued Verge in state courtroom in Sacramento, claiming his ouster was improper and that he owned Verge’s digital accounts. Mr. Cunningham, Verge’s lawyer, stated Mr. Powell’s claims didn’t have any advantage.

In September, Mr. Powell introduced he would step down as Kraken’s chief government whereas remaining chairman. He was changed by Dave Ripley, Kraken’s chief working officer, who took over the agency in March.

Kirsten Noyes and Kitty Bennett contributed analysis.