Sentence:  The paper gave a start to the theater critic Hilton Als and the novelist Colson Whitehead, both recipients of the Pulitzer Prize. Its resident <WSD>muckraker</WSD>, Wayne Barrett, took aim at New York developers and politicians for nearly 40 years, and his obsessive work on Donald J. Trump has become a resource for reporters covering the president today. 
Meaning of the word marked with <WSD> tags:  One who investigates and exposes issues of corruption that often violate widely held values; e.g. one who exposes political corruption or the poor conditions in prisons.