Here are five things you should know about the group.
1. Anti-Islam or pro-free speech? The Southern Poverty Law Center, which tracks extremist groups, lists the American Freedom Defense Initiative as an "active anti-Muslim group."
The New-York-based AFDI says its goal is simply to "go on the offensive when legal, academic, legislative, cultural, sociological, and political actions are taken to dismantle our basic freedoms and values."
2. Pamela Geller is the group's executive director. Again, the SPLC describes her as "the anti-Muslim movement's most visible and flamboyant figurehead."
Geller, of course, doesn't think of it that way. In fact, in a speech delivered just before the contest for cartoons of the Prophet Muhammad opened, she defended her group's actions.
She referenced the January attack on the offices of the French satirical magazine Charlie Hebdo, which was targeted over its own depictions of the prophet.
Geller said that over the years, she has seen an "abridgment of freedom of speech" and her group was gathered to counter that. She says that limiting speech that offends Muslims will hasten the march toward a Sharia state.
"We are here for freedom of speech," she said. "Everything else is a smear."
3. The group was recording as it received word of the shooting. A police officer in tactical gear delivered the news.
The crowd inside the Curtis Culwell Center in Garland went quiet, and as the police officer began to leave, someone shouted, "Was the suspect Muslim?" The video is here; we are not embedding it because it does feature drawings of Muhammad.
4. The group was last in the news over controversial subway ads. As we reported, the group took the New York Transit Authority to court and won the right to post controversial ads at 10 subway stations.
The ads read: "In any war between the civilized man and the savage, support the civilized man." In smaller letters, it added: "Support Israel. Defeat Jihad."
5. Geller is also the leader of the group Stop Islamization of America, which often acts in concert with the American Freedom Defense Initiative. If you remember, StopIslamization of America led the fight against Park 51, a planned Muslim community center not far from the site of the Sept. 11, 2001, attacks in New York City.
"What could be more insulting and humiliating than a monster mosque in the shadow of the World Trade Center buildings brought down by Islamic attack?
"Worse still, the design is a mockery of the World Trade Center building design. Islamic jihad took down those buildings when they attacked, destroyed and murdered 3,000 people in an act of conquest and Islamic supremacism. What better way to mark your territory than to plant a giant mosque on the still-barren land of the World Trade Center? Sort of a giant victory lap. Any decent American, Muslim or otherwise, wouldn't dream of such an insult. It's a stab in eye of America. What's wrong with these people? Have they no heart? No soul?"