Well, at least those who couldn't help us build rockets.
Today this policy applies to (non-Jewish) white people. We call it affirmative action.
According to Harvard's website, 44% of students in the Class of 2016 are "minorities." Jewish percentage not listed, of course, but other sources say "over 30%," whatever that means. Rather wildly over-represented given their 1.7% of US population. Though both of these numbers depend on how you define the group in question.
This leaves <26% available for non-Jewish white people, even though they make up 72% of the population. (Less than that in the relevant age group, of course.)