King Coal by Upton Sinclair

For the most part the victims of this system were cowed and spoke of their wrongs only in whispers; but there was one place in the camp, Hal found, where they could not keep silence, where their sense of outrage battled with their fear. This place was the solar plexus of the mine-organism, the centre of its nervous energies; to change the simile, it was the judgment-seat, where the miner had sentence passed upon him -- sentence either to plenty, or to starvation and despair.

This place was the "tipple," where the coal that came out of the mine was weighed and recorded. Every digger, as he came from the cage, made for this spot. There was a bulletin-board, and on it his number, and the record of the weights of the cars he had sent out that day. And every man, no matter how ignorant, had learned enough English to read those figures.