I didn't realise that unions were still like that in the US
I am stepping up onto my soapbox.
Unfortunately unions have lost a good bit of their clout over the last 30 years. Without going into politics here, let's just say the anti-unionists have been at our throats relentlessly, ever since Reagan fired the Air Traffic Controllers. On the bright side, trade unions have managed to be influential enough to have new contracts every few years or so, depending on the economy. Trade unions are somewhat different than let's say, factory unions. We have to negotiate with multiple contractors. The contractors belong to their own organization. In Philadelphia the two main associations are "The General Building Contractors Association" & "The Interior Finish Contractors Association".
It used to be just the GBCA, but by creating IFCA our strength was diminished. The last time I was on strike was 1997. While the carpenters who worked for contractors belonging to the GBCA were on strike, the IFCA carpenters were not. The IFCA carpenters would not cross a picket line so those contractors got an injunction against having a picket line in or near the job site entrance.
The trade unions reached their peak of power in the '60s. We rode that peak well into the '70s. In 1977, I was laid off, as the economy was in the tank. I didn't find full time employment until '79. From that point I worked steadily until I retired in 2004.
For those who think poorly of trade unions, wages would not be what they are had it not been for the unions. That goes for non-union as well. We have something called "Prevailing Wage". In a nutshell it means that any contractor working on any sort of public work, and most large private work, must pay the union prevailing wage in that area. There are states that have what we call "Right to Work". These states are killing the earning power of everyone.