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MB3 100a: Announcements in Shul on Shabbos (306:12-14)
We don't put a person into cherem on Shabbos except under extenuating circumstances. Announcing on Shabbos that land is being sold (in case someone has a claim to the land). Announcing for sale items on Shabbos. Announcing on Shabbos that someone was kidnapped/abducted.