Right -to-work state is a state in which union membership cannot be required as a condition of employment.

There are always three sides to every story.

To the unions - this means employees can receive the wages and benefits negotiated by the union without paying union dues. They must be represented (although perhaps not vigorously ) by the union in any dispute with management without paying union dues.

For employees - they do not have to pay union dues if they do not want to or do not believe in unions.

To the Company - it is a very useful wedge between employees.

It can make for stressful relations - employees who pay union dues vs. those who do not.

Disclaimer - much of my career has been fighting against unions. I do not take a position on this issue. Just the facts.