เป็นปากเป็นเสียงให้ลูกจ้าง
If employees need someone to speak for them, and HR won't do it, who will? You guess! It is often the absence of someone representing the workers' interests to the decision-makers that is cited as prompting interest in a union. Employee advocacy in a union environment admittedly has some legal and contractual restraints, but it can still be realized.