Is there any history or present practice of members of Irish para-military organisations whose activities were condemned by the Church being denied either communion or Catholic funerals?
During the present Troubles not that I am aware off unless anyone can come up with isolated or specific cases. At a local level clergy had a range of opinions about the IRA, INLA etc. Some supported them, some grudgingly supported them, some loathed them, some supported their aims but not the methods and so on and so on.
I am told that before Irish independence the paramilitary groups were excommunicated.
That depends on the era, the clergy involved and the particular conflict.