sentences:  Wu received bids to pledge at two other fraternities, but it was not until the mid-1960s that racial and religious discrimination was outlawed in Greek organizations at Northwestern.Between 1966 and 1968, Northwestern increased African American enrollments from less than 50 to 160.After the assassination of Martin Luther King, Jr. in April 1968, African American students on campus began expressing increasingly militant and separatist views demanding the administration increase recruitment activity and provide separate facilities for black students.