A lot of unions directly block solving disputes, choosing instead to deny all disputes. I know one union that was perfectly happy letting government workers make sox figures while "working" from home, while they produced objectively zero work over a period of months. These were the type of workers that would keep government equipment after retiring, quitting, or rarely being fired, requiring the government to send officers to collect. Any movement towards trying to get the workers to do literally anything or simply rating them low was met with vehement pushback. Like a union representative storming into you're office and yelling.

In this case, the union was a giant ball of mud whose only existence was to hold the government hostage.

As much as I dislike Thune power corporations can hold, unions are not a fix all and can become the same overlords.