The yards should have hired extra longshoremen as soon as the strike ended.
That's not going to work. The union is protecting the ability of the workers to earn money from the fallout of the strike. Hiring more would disperse the money and work against what the strikers wanted. Remember, for them, this is their primary source of livelihood. For us, it's game books.
And selling these books are FFG's primary source of livelihood - plus a primary source of livelihood for everybody from FFG's distributors to their retailers.
I'm sure the longshoremen care about the people whose livelihoods their strike threatens. They just don't care that much.
And, no, hiring more people would not "disperse" the money - it means that the companies employing them have to pay more to get the job done. It is not unusual for shipping companies (and retailers and...) to hire on additional help during certain seasons of the year - particularly around the holidays - that doesn't mean that their money magically disappears. Of course, if the company can't afford to hire more workers, they may find themselves losing customers: Who wants to use a shipping company that can't ship anything or cannot ship anything on time? It wouldn't be the first time a strike has driven a company out of business and forced the striking laborers to find a new career.