For example, I've witnessed an overpass taking over 2 years to finish (it was blocked off / limited access / under construction the whole time) which involved fixing about 30 feet of road from a unionized crew. Every time workers were on the site it looked really inefficient. Over a dozen people there, but half of them were standing around on their phones, etc.. I've seen countless examples of this over my life time living in the US.
If I were a company I would be terrified that such inefficiencies are protected by a union. Personally I wouldn't fire anyone due to trying to organize one but can someone more knowledgeable in this area explain how a unionized workforce benefits both employees and the business hiring them?