Upton Sinclair 
The Jungle [EPUB ebook] 

The Jungle is a novel by American muckraker author Upton Sinclair, known for his efforts to expose corruption in government and business in the early 20th century.
The book depicts working-class poverty, lack of social support, harsh and unpleasant living and working conditions, and hopelessness among many workers. These elements are contrasted with the deeply rooted corruption of people in power.
A powerful view of turn-of-the-century poverty, graft, and corruption, this fiercely realistic American classic is still required reading in many history and literature classes.