When I was at the P.O., (like and idiot), I joined the union, only to regret it later. Thing is we did not have to join the union, stupid me.
We were told you could only opt out on the anniversary of your starting date, which we could never find out when that was. Even if we could, they would change the rules. lol.
I quit that damned place after only 3 years of their non work, slow down methods of operating.