The 70th annual session of the North Atlantic Treaty Organization, held Nov. 22-25 in Montreal, hit a snag on its first evening when violent activists tried to disrupt the event.

       Metropolitan police were unprepared for the organized assault. So was Canada’s Prime Minister Justin Trudeau, who seems to have had no inkling of the possible security risks that a NATO summit in his country might present. No, the Canadian leader wasn’t out to lunch. He was at a Taylor Swift concert in Toronto.

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