MAMARONECK, New York — Project Veritas founder James O’Keefe said in a speech posted online Monday that he has been removed as the group’s leader.

In remarks that appeared to have been made at a Project Veritas’ office, Mr. O’Keefe said the board had stripped him of all decision-making. 

The move comes after the board reportedly put him on leave from his role as chairman amid complaints about his treatment of staff at the organization, which is known for using hidden cameras and hiding identities to try to ensnare journalists and others in embarrassing conversations and to reveal supposed liberal bias.

“So currently, I have no job at Project Veritas,” Mr. O’Keefe said in the video. “I have no position here based upon what the board has done. So I’m announcing to you all that today on President’s Day, I’m packing up my personal belongings.”

Messages seeking comment were left with Mr. O’Keefe, the group’s executive director, and attorneys for Project Veritas and Mr. O’Keefe, as well as other officials with the organization, which is based at Mamaroneck, New York.

Mr. O’Keefe, who choked up and wiped away tears during his remarks, said several times that the nearly 45-minute speech was for staff internally, but it was posted on the Vimeo platform.

The announcement comes after the group’s executive director and several board members put out a statement last week saying that “a number of our staff members provided leadership with some verbal feedback describing real management concerns regarding the treatment of people and our internal processes.”

Project Veritas, which identifies itself as a news organization, is best known for its hidden camera stings that have embarrassed news outlets, labor organizations and Democratic politicians.

Mr. O’Keefe founded the nonprofit group 13 years ago, and its most recent IRS filings provided to charity regulators in Florida show it brought in more than $20 million in revenue in 2021.

Last year, two Florida residents pleaded guilty to selling a diary and other items from President Biden’s daughter to Project Veritas for $40,000, prosecutors said. As part of its investigation, the FBI searched the group’s New York offices and the homes of some employees in 2021.

Neither Project Veritas nor any staffers have been charged with a crime, and the group has said its activities were protected by the First Amendment.