The Brass Check is a muckraking exposé of American journalism by Upton Sinclair published in 1919. It focuses mainly on newspapers and the Associated Press wire service, along with a few magazines. Other critiques of the press had appeared, but Sinclair reached a wider audience with his personal fame and lively, provocative writing style. Among those critiqued was William Randolph Hearst, who made routine use of yellow journalism in his widespread newspaper and magazine business.