What are Upton Sinclair and Lincoln Steffens known for doing? A.) serving as mayors of Chicago, New York, and Philadelphia
B.) founding progressive organizations in the late 1800s
C.) forming alliances that helped farmers with their credit problems
D.) exposing corruption in business or government

How did the cleveland massacre impact standard oil in 1872? standard oil hired all the laborers who were nearly killed during the cleveland massacre. standard oil became a monopoly in the cleveland oil market after the cleveland massacre. standard oil was bought out by other companies in the city after the cleveland massacre. standard oil closed down to avoid additional violence in the wake of the cleveland massacre.