When I think about what is the most powerful union, I think of the longshoremen. They can make port directors shake in their boots when they threaten to have a work slowdown.
Today it is interesting to watch the technical IT companies like Microsoft state that they know unionization is coming for their workers. Starbucks is having some high-profile unionization activities. Nothing remains static!
Here’s a report that you might find interesting: “The Most Unionized U.S. Occupations in 2022.”