Harvard had an early history of excluding Jews, as did the other Ivy League schools. They were establishment schools, and the establishment back then excluded Jews—and Irish. Then that changed, I think some time in the 1960s.
Hillel House was there when I was at Harvard, and it did indeed offer hospitality and a chance for other Harvard students to meet with Jewish students and learn something about their customs.
I went to a couple of memorial services for dead Jewish friends about that time, and I think one of them was at Hillel House. It was a wonderful experience.
Negros are Jewish surrogates. The Civil Rights movement was fought by the Negros for the benefit of the Jews.
Neither race nor creed.......