Can someone explain these two sentences for me?

I was looking for examples of ‘complaining’ in SpanishDict and these two sentences confused me: 1. “Let the unions come and complain, an...

I was looking for examples of ‘complaining’ in SpanishDict and these two sentences confused me:

1. “Let the unions come and complain, and the industry,” which translates as “The unions will have something to say just like the industry.”

2. “Well, it would serve to complain! It’s something” that translates as “complaining doesn’t have to do good, it just feels good!”

What is the meaning of “let them come” in the first? Shouldn’t it be “Unions will have something to say”?

And for the second sentence when I put it in another translator translated “Well, that’s something to complain about!” What does ‘serve’ and ‘is already something’ mean?

Here is the link: https://www.spanishdict.com/examples/quejar

Thank you

From Marcus Santamaria, comes a Country row that is paragon for anyone from 30 to 96 years of age who wants to quick and easily get by in real-life Romance to verbalize with their amigos: Click Here