The Progressive Era is a social activism and political reform group.
A muckraker is a reform minded journalist who exposed misconduct.
Upton Sinclair focused in the meatpacking industry and wrote a book called The Jungle which exposed the unsanitary conditions of the industry.
Rachel Carson focused on the use of pesticides and released a book called
Silent Spring which uncovered exactly how pesticides were harming the environment.
Seymour Hersh focused on the many different parts of the government including the CIA and the army. He wrote for
The New Yorker and revealed the government's mischief.
These two young men, Bob Woodward and Carl Bernstien, worked together to exposed the corrupt government. They both wrote for
The Washington Post.
Julian Assange focused on "racial transparency" and founded a website called
Wikileaks which allows "whistleblowers" to anonymously share classified documents,