This is a common communication problem between Americans and Europeans where we're using the same word to mean two different types of organization. In the US you should replace "union" with "cartel, likely criminal" eg the boilermakers

"A federal grand jury in Kansas returned an indictment yesterday charging seven defendants, including five current and former high-level officers of the International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmith, Forgers and Helpers (Boilermakers Union) for their alleged roles in a 15-year, $20 million embezzlement scheme."

https://www.justice.gov/opa/pr/two-former-presidents-boilerm...