Elazar Menachem Man Shach was a Haredi rabbi who headed Misnagdim Orthodox Jews in Israel and around the world from the early 1970s until his death. He served as chair of the Council of Sages and one of three co-deans of the Ponevezh Yeshiva in Bnei Brak, along with Shmuel Rozovsky and Dovid Povarsky. Due to his differences with the Hasidic leadership of the Agudat Yisrael political party, he allied with Ovadia Yosef, with whom he founded the Shas party in 1984. Later, in 1988, Shach criticized Ovadia Yosef, saying that, "Sepharadim are not yet ready for leadership positions", and subsequently founded the Degel HaTorah political party representing the Litvaks in the Israeli Knesset.

Moetzes Gedolei HaTorah is the supreme rabbinical policy-making council of the Agudat Yisrael and Degel HaTorah movements in Israel; and of Agudath Israel of America in the United States. Members are usually prestigious Roshei Yeshiva or Hasidic rebbes, who are also usually regarded by many Haredi Jews to be the Gedolim ("great/est") sages of Torah Judaism. Before the Holocaust, it was the supreme authority for the World Agudath Israel in Europe.