COLUMBUS, Ohio (AP) — The deaths of at least four fraternity pledges this year have helped fuel a re-examination of Greek life at U.S. colleges, which have long struggled with how to crack down on hazing, alcohol abuse and other unwelcome aspects without disbanding organizations that have loyal members and alumni. Changing attitudes, increased public scrutiny and fears of facing lawsuits also have caused schools to take action, anti-hazing advocates say.