For Judith Kornblatt, 68, fears of antisemitism lurked throughout childhood. Her mother had fled Austria in 1938, just as the Nazis were taking over, and settled eventually in Evanston, Ill. Ms. Kornblatt, who taught Slavic languages and literature at the University of Wisconsin-Madison, recalled that when the family learned Nazis were planning a march in the neighboring city of Skokie, her mother went into a panic, and flew to Texas to visit a friend.