GREAT NECK - Pamela Geller, an outspoken activist known for her anti-Islamic terrorism viewpoints, spoke before a packed crowd this morning at Chabad of Great Neck in Long Island.

Geller's group, Stop Islamization of America, has been classified as a hate group by the Southern Poverty Law Center and the Anti-Defamation League.

Her speech was originally slated to be delivered at the Great Neck Synagogue, but was canceled. The synagogue claims the cancellation was due to security concerns.

Geller has drawn fire in the past for her opposition to the so-called "Ground Zero mosque" in lower Manhattan. More recently, she caused an uproar after posting ads in New York City subway stations supporting Israel and condemning jihadism.

Her critics say she makes no distinction between peaceful Muslims and terrorists, but she insists that peaceful Muslims should stand with her group and oppose extremism and terrorists.

 "It is a sad day for Long Island," said the Muslim Center of LI Bay Shore Mosque in a statement. "Ms. Geller is not an expert on Islam. We would not allow an extremist Muslim to speak at a mosque."