Lehigh University in Bethlehem, Pa., where 30 percent to 40 percent of the student body belongs to Greek organizations, has imposed sanctions on Greek groups for alcohol and hazing violations this year, and reported that in two cases students nearly died from alcohol consumption. And the University of Pennsylvania this spring announced new procedures for dealing with unrecognized or "underground" fraternities and sororities, where high-risk drinking and other bad behavior have been reported.