Stop Islamization of America (SIOA) is a U.S.-based anti-Islam political advocacy group founded in 2009 by Pamela Geller and Robert Spencer in association with Jihad Watch. It is the American branch of the Danish-based international Stop Islamization movement, which was founded by Anders Gravers. The group opposes the 'Islamization' of the United States, focusing on campaigns against mosque constructions—such as the Park51 mosque—and Sharia law influence, primarily through protests and advertisements.