http://en.wikipedia.org/wiki/Jewish_quota
http://en.wikipedia.org/wiki/Numerus_clausus#Numerus_clausus...
President Lowell of Harvard tried to impose a 12% quota on Jewish admits in the early 20th century, and also attempted to exclude African American students from residing in the freshman dorms. You can find similar behavior at other universities until well after WWII ended. For example, Georgetown's first black student enrolled in 1950.