Why is Eddie from "A View from the Bridge" described as a longshore man?

[LearningEnglish]

In my essay, I said Eddie was described as a longshoreman to give him a strong image at the start of the play but my teacher would like some more details on it. How can I elaborate on it? Thank you very much!

 

[emsr2d2]

... my teacher would like some more details on it.

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