The idea that metaphor of the Passage 1 title, The Jungle, suggests about the meatpacking industry in the early 20th century that it was dangerous.
The passage suggests how the US meatpacking industry was abusing and exploiting laborers, especially immigrant workers. The health and sanitary issues that were prevailing in the industry were against the guidelines of the law.
Therefore, the metaphor dangerous is used to symbolize workers' conditions and their demoralized lives.
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