Charlie Hebdo's wisecracking cartoonists knew the dangers of taking on radical Islam, but they refused to let death threats stop them from speaking out for what they believed in.

The French satirical paper — where 12 people were slaughtered by Muslim terrorists Wednesday — never stopped mocking the hate and hypocrisy of Islamic fanaticism, even after their Paris offices were firebombed in 2011.

Just this week they sent a mocking tweet to ISIS leader Abu Bakr al-Baghdadi and ran a front-page story about a new novel called "Submission" that imagined France under a Muslim president.

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