The Bible says [the worker] started grumbling about what happened, grumbling about his wages and Jesus answered and said to him "am I being unfair to you friend? Didn't you agree to work for a day's wages? You take your pay and go. I want to give to the one who was hired the same as I gave to you. That's my choice." Here it is, Matthew 20:15. "Don't I have the right to do what I want with my own money?"

Now, two things come out here, is if an employee agrees to work for an employer, that's a contract between the two of them ... and Jesus points out that you can go to a different vineyard if you don't like what I'm paying. You've got the free market, you can go choose a different employer. You agreed to work for me for this wage and that's what you're going to get. So first you get the inviolability of contracts between employers and employees ... and whatever is fair has nothing to do with it. That's not their responsibility to be fair, it's "I gave my word, that's what I agreed to work for." So Jesus says, as an employer, isn't my money mine to do with as I please?

Second point is, where were unions in all this? The contract is between an employer and an employee, not between a group. He went out and hired individually the guys he wanted to work.