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William Ayers, the one-time Weather Underground leader who has become a leading education researcher at the University of Illinois at Chicago, has again been barred from Canada. Over the years, Ayers has visited Canada many times, but was turned away in January when he was trying to go to the University of Toronto to give an invited talk. Now he has been rejected in his attempt to go to Ottawa for a talk that was to have been given Monday at the Canadian Congress of the Humanities and Social Sciences, The Ottawa Citizen reported.