You claim to be in an electrician's union, but you clearly don't understand what that means. Is the small church your wife attends a unionized workplace? Obviously not. So why would your union care that you change out a light bulb?

Mandy Gould on the other hand is volunteering her time to do a unionized job in a unionized workplace. And it's a union she belongs to in another local! Have your shop steward explain it to you if you don't get it.