Barrett Brown Arrested: Former Anonymous Spokesman Taken Into Custody After Threatening FBI Agent

This image taken from a video posted by Internet hackers on the Greek Justice Ministry web site on Friday, Feb. 3, 2012, show
This image taken from a video posted by Internet hackers on the Greek Justice Ministry web site on Friday, Feb. 3, 2012, shows a figure in a Guy Fawkes mask reading a statement. Greek and Cypriot hackers from the "Anonymous" group said in a statement on the hacked web site that their action was to protest Greece's signing of the ACTA copyright treaty. They threatened with future attacks on Greek government and media sites if Greece implements the treaty. (AP Photo/Petros Giannakouris)

A former spokesman for Anonymous was arrested late Wednesday, according to the hacker group and the Dallas County Sheriff’s Office, just hours after posting an online video in which he threatened an FBI agent.

Barrett Brown was arrested shortly before 11 p.m. and turned over to FBI custody, according to Carmen Castro, a spokeswoman for the Dallas County Sheriff’s Office. Castro could not say what he had been charged with. Brown's attorney, Jay Leiderman, told his client was charged with making threats to a federal agent.

Katherine Chaumont, a spokeswoman for the Dallas office of the FBI, declined to comment.

Federal authorities have arrested several alleged members of Anonymous over the past year in an effort to disrupt the hacker group, which has taken credit for a series of high-profile cyber attacks.

In March, Brown’s home was raided by the FBI, which confiscated his laptop, according to Gawker.

His arrest Wednesday came just hours after he posted a YouTube video in which he appeared to threaten an FBI agent for allegedly harassing his mother.

Brown was one of the few public faces of Anonymous, a shadowy group that prides itself on not having central leadership. He has reportedly co-authored a book, which has yet to be published, about his experience working for the hacker collective.

On Thursday, Anonymous released a statement on the file-sharing site Pastebin detailing what it claimed were credit card numbers, addresses and phone numbers of 13 federal government employees. On Twitter, the hacker group said the release of the information was in retaliation for Brown's arrest, calling him “our controversial hated/loved friend.”

In 2010, Brown wrote a column for the Huffington Post, calling Anonymous “among the most important and under-reported social developments to have occurred in decades.”