I've got mixed feelings on unions.
From a meta perspective, they were key to forcing businesses to correct a lot of ugliness. They also pulled a lot of folks out of poverty. From a personal perspective though, every contact I've had has felt like an exercise in obstructionism.
Probably the most memorable - we were going onsite to install equipment at a client. As me and the other tech come down the hallway their chief engineer, a short, 300 pounder, comes sprinting at us, arm outstretched, hand up, and shouting "NOOOOOoooo!". Looked like a slow mo movie scene. Now I'm thinking, is someone getting killed? What's going on? Should we seek cover? And I'm a looking around but there's no one about but me, the other tech, and a now huffing and puffing Chief Engineer.
Turns out their union contract required any outside material be carted in by union labor. By carrying our toolboxes we were creating a union beef. Chief Engineer escorted us back to the entrance so a union guy could carry our bags for us...