The Jungle is a 1906 novel written by author and journalist Upton Sinclair. Sinclair wrote the novel to highlight the plight of the working class and to show the corruption of the American meatpacking industry during the early-20th century. The novel depicts in harsh tones poverty, absence of social programs, unpleasant living and working conditions, and hopelessness prevalent among the working class, which is contrasted with the deeply-rooted corruption on the part of those in power. Sinclair's observations of the state of turn-of-the-century labor were placed front and center for the American public to see, suggesting that something needed to be changed to get rid of American "wage slavery". The novel is also an important example of the "muckraking" tradition begun by journalists such as Jacob Riis.

Upton Beall Sinclair, Jr.(September 20, 1878–November 25, 1968) was an American author who wrote nearly 100 books and other works across a number of genres. Sinclair's work was well-known and popular in the first half of the twentieth century, and he won the Pulitzer Prize for Fiction in 1943.In 1906, Sinclair acquired particular fame for his classic muckraking novel, The Jungle, which exposed conditions in the U.S. meat packing industry, causing a public uproar that contributed in part to the passage a few months later of the 1906 Pure Food and Drug Act and the Meat Inspection Act. In 1919, he published The Brass Check, a muckraking exposé of American journalism that publicized the issue of yellow journalism and the limitations of the “free press” in the United States. Four years after publication of The Brass Check, the first code of ethics for journalists was created. Time magazine called him "a man with every gift except humor and silence." He is remembered for writing the famous line: "It is difficult to get a man to understand something, when his salary depends upon him not understanding it."