Queen's University Belfast has dis-invited Professor Geoffrey Alderman, at the last moment, from a panel he was previously invited to participate in on the topic of the conflict in the Middle East. There are hints in the story that critics of Israel who are on the panel refused to appear alongside him: they can't be sullied by having a supporter of Israel in their midst.
CiF Watch has the story, with various links; Jonathan Hoffman seems to be on site.
I regularly give voice to folks I intensely disagree with; frankly, it seems to me that listening to them bolsters my own positions. Apparently not everyone feels the same.