How difficult is freedom of establishment and operation of trade unions in capitalist society?

How difficult is freedom of establishment and operation of trade unions in capitalist society?
 I've seen a lot of forum posts and listened to professionals share many difficulties about unions in the United States. 
For example: Negotiations to sign collective bargaining in the United States can last longer than 5 years to successfully sign. However, in Vietnam, the statutory prescribed time to signed a collective labor agreement is very clear (about 1 month) bringing many benefits to the laborers.

So, what benefits do freedom of establishment and operation of trade unions in capitalist countries bring to employees? I always want to know more and more!!!
Cao Nghĩa TDTU

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