The employer (in this case is the government) is the one dealing with the union, not you or me. When I go to the passport office I am dealing with a government employee. Who is at that time representing the government, not the union. I never have had to deal with a public sector union. The only time I have had to deal with a private sector union is when I was part of one. When I shop at grocery stores that are unionized, I dont deal with the union, I deal with employees of that company. If I have a complaint about said workers performance I talk to the company, not the union.
Which means none, not one of the services I pay for are "union" services. They are either government supplied services or privately supplied services. I pay the government or the company for those services not the union. The employee pays the union for the services the union provides to him/her. Not me