Sorry for the confusion - I know a Credit Union. - The CU has got so big it now needs for an UNION like a Trade union. Where people can go to and get fair and square answers and help with what is going in the CU>
See points 1 and 2 here (although it may be different in Ireland)
https://www.gov.uk/trade-union-recognition-employers/overview.
You can join individually and a a few of you can apply to have the union recognised. If they agree then you're okay. If you are okay and you have 21+ you can apply for statutory recognition.
That's my interpretation