Random Riddle: Polarity - Common Sense Evaluation

Ahead of us, a life of servitude lies
There is no funeral when one of us dies

Below the surface, we perform our duty
But we’re not miners or in search of booty

We join forces if our mission requires
Forming a “chain gang” that one day expires

Destined for a multitude of thankless jobs
Although none of us ever complains or sobs

Varying, yet with this similarity
We’re all characterized by polarity

What are we?

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