When it was introduced last year, the Federal Bureau of Investigation's "Don't Be a Puppet" campaign was billed as a novel way to help educate teenagers about avoiding the pull of violent extremism.

The website, which teaches users how to pinpoint when young people are drifting toward radical ideology, is part of a broader initiative launched by the federal government to counter homegrown extremism. The site's development comes as the Islamic State terror group seeks to ramp up its recruitment of young people in the West.

But as high-school students around the nation continue to settle into a new school year, the American Federation of Teachers union and other groups have come out against the campaign.

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