My first involvement in a union was a trade union, I went from making $7 an hour building houses to $17-$21 per hour depending on the job. For the most part it was all bull work, and yes, we worked, the guys that didn't were sent home at the end of the week. My last couple of years in construction I did a lot of lay out and instrument work because I was thorough and very particular. I enjoyed that work because it made my mind work, and I didn't feel like a mule pulling a plow every day.
I left the trade to work in a union chemical plant, it's a completely different structured union than trade unions. The work was more busy work, but it was 12 hour swing shifts, if you've never worked them, you have no idea what they do to you, and I can't explain it to make you understand. It's one of those things you have to experience to understand. We made good money, at least for around here but you are being paid for your health.
I've been told several times by company people who were involved in contract negotiation that our wages were only a small part of the cost for making the product. At least in the chemical plants I worked in.
Unions aren't perfect, but when they came about, they were needed. I have seen folks protected that should've been fired but I have also seen the inverse.
For folks that say unions ruined whatever industry, corporate greed plays a role in it too.
Are unions perfect? No, but who are what is?