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thanks for your invitation to answer this question, first of all the answer depend on two parts:
1- If we suppose the labor rights are the same in different places, such as time of work , living, food expenditure, ect.. so the need of Union sometimes play the big role of protect , saving at least the minimum limit to help those labor staying in human situation, but iam afreid i donot agree mor with you, not only the labor union protect the rights, the main responsability depend on the government , yes, missing of any lapor rights will effect on the income and making unstability.
2-unfortunately i am not travel to the Gulf countries, so i can't make any comment.