The Prophet Muhammad cartoon contest that exploded in violence over the weekend in Texas was organized by Pamela Geller, a New York activist who rails against Islam with such ferocity that one of the nation's top civil rights groups lists her in its "extremist files."

WHO IS PAMELA GELLER?

Geller, 56, is head of an organization called the American Freedom Defense Initiative, whose mission, according to tax records, is to act against "capitulation to the global jihad and Islamic supremacism."

Through websites, books, ad campaigns and public events, Geller has been warning for years about the "Islamic machine" that she says threatens to destroy the U.S.

She famously led the campaign in 2010 — under a different group, called Stop the Islamization of America — to prevent the opening of an Islamic community center blocks from the World Trade Center site. She called it the "ground zero mosque."

The Southern Poverty Law Center, a nonprofit organization that tracks hate groups, keeps a dossier on her in its "extremist files," calling her "the anti-Muslim movement's most visible and flamboyant figurehead."

The law center describes her as "relentlessly shrill and coarse in her broad-brush denunciations of Islam" and notes some of her more sensational claims, including that President Barack Obama is the "love child" of Malcolm X.

The weekend contest in Garland, Texas, was offering $10,000 for the best cartoon of Muhammad.

LEGAL ACTION

Geller has been involved in numerous lawsuits across the U.S. in recent years, many of them related to her attempts to display incendiary ads in public transit systems.

Most recently, New York City's transit authority banned all political advertising after a judge upheld Geller's right to run bus ads that said, "Killing Jews is worship that draws us close to Allah."

In 2012, the transit authority was forced to run Geller ads that read: "In any war between the civilized man and the savage, support the civilized man. Support Israel. Defeat Jihad."

She paid for similar ads in San Francisco, Detroit and Washington.

In June 3013, Geller and a colleague were barred from entering Britain to attend a march that ended in the London neighborhood where a British soldier was killed by Islamic extremists.

FINANCIAL BACKING

American Freedom Defense Initiative took in nearly $160,000 in 2012 and $960,000 in 2013, according to tax filings. It did not list any donors.

Its 2013 tax form also lists a related tax-exempt organization called Jihad Watch, with an address listed in Manchester, N.H., whose primary activity is "civil liberties advocacy." Robert Spencer, a fellow activist who runs the blog Jihad Watch, was listed as vice president, with a salary of $24,461.

Geller herself earned $192,500 in 2013, records show. Three other employees — James Lafferty, Pamela Hall and Richard Davis — are described as board members who were not paid a salary.

A recent report by the Center for American Progress, a think tank in Washington, said Geller's top donor included the Fairbrook Foundation, which gave $253,250 to Jihad Watch. The Fairbrook Foundation supports a number of mainstream conservative groups.