What progressive exposed the abuses of the united states steel company in 1901?

The correct answer is Ray Stannard Baker.

The individual who exposed the abuses of the United States Steel Company in 1901 was Ray Stannard Baker.

Ray Stannard Baker (1870-1946), was a journalist that denounced the activities of the U.S. Steel Company of Andrew Carnegie in 1901. Ray was part of the “muckrakers”, that was a name coined by President Wilson to the journalist dedicated to investigating and exposing the dirty businesses of corrupt companies and individuals. Ray worked for a magazine called “McClure’s”, an important and influential magazine of that time, owned by an Irish man named Samuel McClure.