Work less. There is no point in trying to put out anymore output than the bare minimum required if that's both the agreement between the union and the employee (promotions based on tenure) and between the union and the company (agreements on what minimum deliverables employees will deliver).

>Of course, that is what a strike is, but a necessary evil.

It's more than a strike. Continuing what I wrote above, unions will introduce obvious inefficiencies in order to support red tape processes rather than focusing on what the company is trying to accomplish. (e.g. no code can be committed without a review by two other clocked in union members while being backed by a ticket groomed by a clocked in agilist and released by two clocked-in SRE folks).