They are your local Mafia branch
If you set up a session, they'll send the boys around on the basis that some of it *might* be copyrighted music. The 'boys' will probably be from CCE, who are giving their full support to their activities.

I've set up sessions, and I know many people who have done the same (the latest being the North Wicklow Singing Circle)--for example the folks in my Sunday session have been playing twice a week for twenty years. They don't seem to have had this problem. Can you name some sessions where this has occurred?