Mr. Ayers was scheduled to deliver a keynote address at the Worldview Conference on Media and Higher Education this Thursday in Toronto. Conference organizers say Mr. Ayer's refused entry should "should raise red flags for citizens concerned with free and open debate."
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Mr. Ayers was barred from entering Canada in 2009 after touching down at Toronto City Centre Airport. At the time, he said he had entered Canada dozens of time before without incident.