Antisemitic messages were written at various spots across the University of Wisconsin-Madison campus on the first day of classes this week, prompting an apology from frustrated administrators at the school, which has a significant Jewish population. The chalk messages targeted student Jewish groups by labeling them "racist," "genocidal" and "having blood on their hands." The messages appeared in front of several buildings on Wednesday, the first day of classes. This school year marks the first under new Chancellor Jennifer Mnookin, who is Jewish. "To those Jewish students and others affected, we are sorry for the impact this had on your...