Radical Muslim converts defend violence against the U.S. outside a New York mosque . Inside the mosque , an imam warns against violence . Authorities say the language is ` ` right up to the line '' of free speech protection . Put the full message on ` ` AC ##P '' tonight , " ET .
Radical Muslim converts defend violence against the U.S. outside a New York mosque . Inside the mosque , an imam preaches against terrorism . Authorities say the language walks `` right up to the line '' of free speech protection . See the full investigation on `` AC 360 '' tonight , 10 ET .