 Branches of the kollel were opened in Bnei Brak, Jerusalem, Haifa, Ofakim, Kiryat Sefer, Petah Tikva, and other locations.Rabbi Lefkowitz was a member of the Moetzes Gedolei HaTorah of Degel HaTorah, a member of Mifal HaShas, and "nasi" (president) of the Acheinu kiruv organization, and played a leading role in the fight for Torah-true education in yeshivas and Talmud Torahs in Israel, appearing at rallies and signing on many "kol korei" (proclamations).Rabbi Lefkowitz was instrumental in saving the lineage of a variety of Balady Citron called "the Chazon Ish etrog", which was certified as kosher for the mitzvah of etrog by the Chazon Ish himself.