Upton Sinclair, Frank Norris, and Ida Tarbell

made their greatest contributions to the

Progressive movement by

(1) working to end political corruption in cities

(2) speaking out for the equal rights of Hispanic

Americans

(3) supporting legislation to improve tenement

housing

(4) publishing books and articles to expose the

problems of society

Upton Sinclair, Frank Norris and Ida Tarbell made their greatest contributions to the Progressive movement by (4) publishing books and articles to expose the problems of society. Upton Sinclair wrote a book which showed the dangerous and unsanitary lives workers of the Meatpacking District went through on a daily basis, Frank Norris exposed the struggle railroad workers go through with their bosses and the unfairness of the railroad workers life in California and Ida Tarbell wrote about the manipulative men behind the oil trade.