Michael Avenatti, the controversial lawyer facing criminal charges in three separate serious federal cases, was dramatically arrested by federal agents in California on Tuesday for allegedly violating the terms of his bail release in one of those cases.

Avenatti, who is accused of swindling clients including porn star Stormy Daniels out of millions of dollars, was taken into custody during in a disciplinary hearing of the State Bar Court of California in Los Angeles, where he had been testifying.

The California Bar at that proceeding was seeking to place Avenatti on "involuntary active status" in response to a claim of scamming a client out of more than $800,000.

A spokesman for the U.S. Attorney's Office in Los Angeles, Ciaran McEvoy, told CNBC that Avenatti was arrested by IRS agents from that agency's criminal investigation division. The IRS is the lead investigative agency in the prosecution in California of Avenatti.

McEvoy was unable to detail how Avenatti allegedly violated his bail conditions. The spokesman noted that the arrest warrant for Avenatti, which would lay out those allegations, was sealed by the judge who signed it earlier Tuesday.

Under the terms of Avenatti's bail, his travel normally had been restricted to and from certain areas of California, New York state and Florida. Domestic travel to other locations was allowed with at least two business days' notice to federal Pretrial Services, with international travel needing prior court approval, according to a ruling by a judge last June.

Avenatti had been free on a personal recognizance bond of $300,000, which did not require him to post any money or assets to secure.

Avenatti's attorney Dean Steward, in an email to CNBC, said that his client "is being held without bail, pending" a hearing Wednesday morning, at 2 p.m. Eastern Time, before Judge James Selna in U.S. District Court in Santa Ana, California.

The bombastic litigator is due to go on trial next week in federal court in New York City in another case in which he is accused of trying to extort more than $20 million from athletic apparel giant Nike by threatening to expose alleged evidence of bribing amateur basketball players and their families unless the company paid up.

Prosecutors in the New York case informed the trial judge of Avenatti's arrest in a letter Tuesday night.

"Completely innocent," Avenatti said outside the Bar Court after his arrest, according to The Daily Beast, which had a reporter at the bar hearing.

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Avenatti has pleaded not guilty to all criminal charges against him, which were lodged last spring, more than a year after he became a leading critic of President Donald Trump in connection with his representation of Daniels, who claims to have had sexual tryst with Trump more than a decade ago.

Hours before his arrest Tuesday, Avenatti was on a telephone conference call with his lawyers, prosecutors and reporters as a judge in Manhattan federal court heard arguments to postpone that trial for the alleged Nike extortion bid by a month to give his defense team more time to digest thousands of pages of documents recently turned over by prosecutors. The judge declined to delay the trial.

He separately is charged in the same Manhattan courthouse with scamming Daniels out of $300,000 in proceeds from of a book deal. A trial in that case is set to begin April 21.