 During Rabbi Hoffman’s tenure, Rabbi Shlomo Breuer, the son-in-law of Rabbi Hirsch, served as the rabbi of Adas Yeshurun.The very existence of two "kehillot" (communities) side by side, each with its own system of kashrut, for example, can lead to rivalry and conflict.In this particular case, however, there was another element that institutionalized the conflict — the issue of Austritt (secession).