The country clubs around Chicago used to be like this; there were several high-end clubs whose membership was predominantly Jewish. I don’t think they discriminated against any member applicant who was not Jewish, but the membership appeared to be geared toward those applicants who were very well-educated and professionally successful. In this, they didn’t differ from most other high-end clubs in the Chicago area.
I have a hard time seeing how this is harmful....in a sane and humane world, people would have the right to freely associate with whomever they want (which necessarily means not associating with those whom they don’t want). But I guess that’s pretty much a dream
Hillcrest was started by Jews in the motion picture business because they were excluded from the prominent Gentile club. Rather than explicitly ban Jews as such, the Gentile clubs banned anyone in “show business” - show business being populated almost exclusively by Jews.