Unions provide many things but in a nutshell they help protect workers from poor treatment and help negotiate wages and benefits.
Why they are disliked is a harder question. Some people feel like they are held back and feel like they can negotiate benefits better for them selves. Some don’t like that unions protect bad and good workers equally. Me personally, I don’t like them because I am required to join them in my state as a condition of employment and the union uses my money for political causes I disagree with.
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