In April 2010, Molly Norris, an editorial cartoonist at the Seattle Weekly, learned that the creators of the TV comedy "South Park" had been threatened with death by a Muslim extremist. The threat came after an episode in which the Prophet Mohammed appeared in a bear suit -- an allusion to Islam's prohibition against his depiction.

Norris was indignant at this use of threats of violence to stifle free speech. In protest, she drew a lighthearted cartoon of a poster announcing "Everybody Draw Mohammed Day." Tongue firmly in cheek, she named the day's sponsor as a nonexistent group: "Citizens against Citizens against Humor."

Today, Norris fears for her own life. On the FBI's advice, she's "gone ghost" -- changed her name and identity and abandoned her livelihood. The reason: A radical Muslim imam has called for her assassination on grounds that she blasphemed against Islam.

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