In ‘Watershed Moment,’ YouTube Blocks Extremist Cleric’s Message

The site has largely removed videos of Anwar al-Awlaki, Al Qaeda’s leading voice in English before his death by drone — and after, when he became a jihadist hero.

WASHINGTON — For eight years, the jihadist propaganda of Anwar al-Awlaki has helped shape a generation of American terrorists, including the Fort Hood gunman, the Boston Marathon bombers and the perpetrators of massacres in San Bernardino, Calif., and Orlando, Fla.And YouTube, the world’s most popular video site, has allowed hundreds of hours of Mr. Awlaki’s talks to be within easy reach of anyone with a phone or computer.Now, under growing pressure from governments and counterterrorism advoc...