A muckraker is an American English term for one who investigates and exposes issues of corruption that violate widely held values, such as political corruption, corporate crime, child labor, conditions in slums and prisons, unsanitary conditions in food processing plants (such as meat), fraudulent claims by manufacturers of patent medicines, labor racketeering, and similar topics. In British English however the term is applied to sensationalist scandal-mongering journalist, … Wikipedia
The definitive Wikipedia entry for Muckraker. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Muckraker