In working with some public sector unions though, arguing for management, I've actually seen very different focuses in play: namely efficiency. The unions with whom I work are definitely about fair labor practices, and pre-decisional input, and that is just common sense though. In working with them I was very impressed with what I saw. They never talked politics, only members, and issues confronting them regarding efficiency which was in their agreement with management.

Now, on the other hand, had a neighbor that was high up in leadership of a national union. He never talked with me about efficiency, or his members, just continual rants around a specific political party, and how he was attending political events from his political party.