The Muslim NYPD cop killer Ismaaiyl Abdullah Brinsley worked for a Muslim Brotherhood front group, according to his Facebook page. GotNews.com has confirmed and exclusively discovered that Brinsley went by another name — Ismaaiyl Abdullah-Muhammad — and that he worked for the Islamic Society of North America. The Islamic Society of North America is a Muslim Brotherhood front group that was described as an unindicted co-conspirator by the Justice Department in the 2007 Holy Land terror cases.