Summarize the various ways the factory would use or cover up spoiled meat ?

Upton Sinclair's The Jungle is an excellent book that describes numerous mechanisms that led to meatpacking infractions. Workers in meat processing plants would replace old and diseased meat with healthier cuts.

Pork fat and beef scraps will be processed or canned in the same way as chicken is. Many of these meats would be minced and turned into sausage.

About The jungle:

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The various ways the factory would use or cover up spoiled meat given below.  

Explanation:

The Jungle by Upton Sinclair is a perfect book which explains several processes by which violations of the meatpacking happened. Meat factory workers would prepare rotten and diseased meat with better meats. The unpleasant pork fat and beef scraps will be packed or canned like chicken. Many of these meats would be chopped up to make sausage.

they remained in rural areas and worked at jobs such as lumbering or farming.