The journalist known for her groundbreaking work that exposed corruption and inequality in America is Ida B. Wells. A prominent figure in the late 19th and early 20th centuries, Wells was an investigative journalist who bravely confronted the issues of lynching and racial injustices. Through her writings, particularly her pamphlets and articles, she highlighted the realities of oppression faced by African Americans. Her courageous work laid the foundations for civil rights activism and transformed investigative journalism, making her a historic figure in the fight for social justice.