Unions help to fight inflation and price gouging as well. Unions are good for the entirety of any economy in which they exist. There are decades upon decades of independent and government funded research that supports this.

https://theconversation.com/unions-do-hurt-profits-but-not-productivity-and-they-remain-a-bulwark-against-a-widening-wealth-gap-107139

https://home.treasury.gov/news/featured-stories/labor-unions-and-the-us-economy

https://www.epi.org/publication/unions-and-well-being/