I'd have to say that the best working conditions seem to be created not by unions or corporations, but by the tension between unions and corporations. The musician's union is pretty much the strongest one there is, and they get their way a surprising amount of the time. However, often we find that we win battle after battle only to make the war more and more hopeless. It is true that a union's first duty is to itself - otherwise they would fade away and not do anyone any good. This is also why they can do destructive things when their power gets to the point that they are basically unopposed.
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Cogito ergo spud -- I think, therefore I yam
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