Why isn’t Monsey affiliated? Wasn’t Monsey started by the Chofetz Chaim’s einekel before the war.
What R’ Mendel started before the war was a charity to raise money for the yeshiva in Radin. After the war he reestablished the yeshiva but instead of becoming the Rosh Yeshiva (He was a Rosh Yeshiva at REITS at the time) he gave that position to his son R’ Gershon.