<span>it's Melodramatic-a sensational dramatic piece with exaggerated characters and exciting events intended to appeal to the emotions.
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The "great packing machine" refers to the slaughter industry the author describes through the book. He is trying to portrait and denounce the unhealthy, dangerous, almost-enslavement condition the workers suffer in that industry.
Loitering is not allowed on school grounds, those who do not follow the rules ought to be executed.