Ali voiced his concern to 20 other imams during the April National Imam's Consultative Forum, which has the backing of the Aussie government.
"We have had a program for the last seven years now in which we have had 240 people who were considered to be moving in a direction which may have led them to violent radicalisation - to terrorism," Imam Afroz told the national forum.
"What we have found is, of the 240 people, 120, exactly half of them, are people who have changed their thinking, their mindset. That is something that I don't necessarily share too widely in public, but I am happy to share it here."
The videotaped conference is only just airing on Channel 7's Today Tonight, and they were unable to contact Afroz for comment. However, ex-radical Maajid Nawaz was available to talk.
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He said he did not consider it a success that there were still 120 young radicals potentially headed for terrorism.
"I find it astonishing we've got one centre that has 240 radicals," Mr Mawaz told Today Tonight
"If 120 can become violent in one Islamic centre, that tells me the scale of the problem. It's massive because that's only one centre."
Australians should be very scared.