One day, Alfred Zeien, chairman of Gillette Co., received a letter objecting to his company's research methods: "Let this be a warning to you. If you hurt another animal, if I find out, one month from [when] this letter arrives to you, I'll bomb your company. P.S. Watch your back."

It turns out the letter came from a sixth-grader at the James Martin School in Philadelphia, whose teacher had given an assignment to write letters to companies about animal testing based on educational materials distributed by People for the Ethical Treatment of Animals.

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