Since we permit to pray with those who were excommunicated (I mean menudim or muhramim i.e. in niduy or 'herem) in Kol Nidre, does the community need to reinstitute relevant niduyim/haramot the day after Yom Kippur? E.g. Someone refusing to grant a get for a while who had niduy imposed. 11th of Tishrey comes, he still refuses. What now?
On Yom Kippur we do not permit an excommunicated person to pray in the Shul. We permit an Avaryon (עבריין) to pray in the Shul. A excommunicated person is someone who is in Cherem (חרם). There is no mention of allowing an excommunicated person to join in the Shul on Yom Kippur.
Here is a link to see the entire Kol Nidrei where there is no mention of excommunicated people.