(US News & World Report) — The Justice Department’s Bureau of Prisons is probing so-called “hate sermons” from Nation of Islam leader Louis Farrakhan, available to most federal inmates, to see if they radicalize prisoners or even turn them into terrorists.

In a letter to Rep. Frank Wolf, who first raised the issue, Bureau of Prisons Acting Director Thomas Kane said he would review the most sensational sermons in the prison catalog such as “Bible, Truth or Altered by the White Man” and another suggesting that 9/11 was a cover to hide oil profits to former Vice President Dick Cheney.

What’s more, Kane said in the letter, he has already added a class on chapel security to the training for prison chaplains. “Bureau staff will continue to review all chapel library materials to ensure that resources comply with current law and policy,” he said.

Wolf and Rep. Peter King had raised red flags over the materials available to prisoners, even convicted terrorists, in prison chapels.

In a statement to Whispers, he said, “I appreciate the Bureau of Prisons’s prompt response and willingness to review these extremist materials. Radical and anti-American texts have no place in American prisons. As chairman of the appropriations subcommittee that funds the Bureau of Prisons, I committed to ensuring that our nation’s prisons are a place of rehabilitation not radicalization.”

Among the Nation of Islam video titles offered to inmates are “Conspiracy of the International Bankers,” “Conspiracy of the U.S. Government,” “Controversy with Jews,” and “Which One Will You Choose, the Flag of Islam or the Flag of America?”

Kane wrote Wolf, “We appreciate the great importance of controlling and preventing the recruitment of inmates into radical behavior and extremist ideologies.”