I think the cartoonist is trying to say about the possibility of a labor union revival is slim since the labor union are asleep, not working and not even willing to take the offer given to them and also the labor union is much more interested in bigger offer.
The key purpose of labor unions is so that workers may have the power to negotiate in terms of good and favorable working conditions.
The benefits of this union can be gotten via collective bargaining which is known to be the heart of the labor union.
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