Answer:
A "Muckraker" was a term for an investigative journalist who exposed social injustice in the Progressive Era.
Step-by-step explanation:
Muckrakers were Progressive Era reporters and novelists who threatened to expose inequality within government system and giant business. Muckrakers' work inspired the adoption of important reforms that reinforced worker and worker protections.
The very known women who were the muckrakers like Ida Tarbell and Ida B. Wells. Sinclair was among the most prominent muckrakers of the Progressive Era, and in 1905 he had published "The Jungle" to promote awareness of the abuse and terrible circumstances to which laborers were exposed in the meatpacking industry.