I was just going to post that there were probably more "Jewish sororities" back then -- AEPhi had a chapter, DPhiE had a chapter until 1973 that may or may not have been considered "Jewish," and it's possible that there were even some other NPC sororities that no longer exist that were there too.
I'm not sure how that works either, but I agree that rush rules were probably more relaxed back then.
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