They have TONS of unions, spread all across the US. Many of them are corrurpt. Have you seen the movie "Waiting for Superman"? It is a pretty good exposition on how teachers unions in a lot of school districts that are difficult to hire for (inner-city mostly) benefit the teachers at the great expense of all students.

I saw the same in my years in Chicago (and Lori Lightfoot gave into their terrible demands that will drain the city of money and resources).