Investigative reporting has been a cornerstone of journalism, exposing corruption and injustice. From Ida Tarbell's exposé on Standard Oil to Woodward and Bernstein's Watergate coverage, these reports have shaped public opinion and policy. These classic investigations employed various techniques, from extensive research to undercover reporting. They often faced ethical dilemmas and legal challenges, but their impact on society has been profound, leading to reforms and increased accountability in government and business.