Open this photo in gallery:Judy Weissenberg Cohen in Toronto, 2019.Courtesy of Azrieli FoundationIn 1993, Judy Weissenberg Cohen was nearing her 65th birthday and mandatory retirement when, during a lunch-break stroll through downtown Toronto, she saw a group of young people clad in black leather marching in a circle and shouting, “White power! White power!”A certain fear was automatic, she later wrote in her memoir, like the feeling of her stomach clenching when she witnessed people being selected for death at Auschwitz-Birkenau. “For a terrifying few seconds, the lines were blurred between past and present. I wondered, was I looking back...