All of the following subjects would have been likely to be covered by muckraker journalists EXCEPT the Spanish-American War. Muckraker journalists were a group of investigative journalists who were active in the United States in the late 19th and early 20th centuries. They were known for their work in exposing corruption and injustice in American society. Some of the most famous muckraker journalists include Ida Tarbell, Lincoln Steffens, and Upton Sinclair.