The Jewish advocacy group, which intends to hold a news conference Wednesday to release the material, said it plans to ask both local police and the RCMP to investigate whether any crimes might have been committed.
Mohamed Boudjenane, executive director of the Canadian Arab Federation, dismissed the tactic as an attempt to divert attention from the horrors of Gaza - horrors perpetrated, he said, by the Israeli military.
"We had 10,000 people (protest)," Boudjenane said.
"How can you control every single person there and not have someone who will scream some weird stuff or someone who could have a flag of Hamas or whatever? But the purpose of the march has nothing to do with that."
Thousands of people have demonstrated in cities across Canada against the attacks on Gaza that have killed hundreds of people. There have also been several similar rallies across the country expressing support of the Israeli action.
The Israeli government says the invasion was in retaliation for Hamas rocket attacks on Israel from the Palestinian territory.
The congress said it would release a list of those who co-sponsored the anti-Israel protests, among them the Ontario wing of the Canadian Union of Public Employees, the Canadian Peace Alliance and the Canadian Union of Postal Workers.
Boudjenane pointed out that numerous Jews have also rallied against the Israeli attacks, naming some prominent ones such as author Naomi Klein and political and social activist Judy Rebick.
They aren't anti-Jew, he said, but were only there to protest the "massacre" happening in Gaza.
Boudjenane also accused pro-Israeli counter-demonstrators of taunting the pro-Palestinian side with such epithets as "murderer" and "terrorist."
