// dues page //
With the dues check off clause, the company would be required to deduct monthly union dues from your paycheck before you even get it. The company then mails one check to the union. That way, the union makes sure it gets its money first. It also keeps the union from having to chase employees every month to try and collect union dues money.
To do the accounting in order to pay the union dues, it costs the company time and money. The only thing the union has to negotiate with to balance that is your wages, benefits and working conditions. So if the union wants dues check-off in the contract, it has to give up something.