In the early 1900s which issue most concerned Wisconsin senator Robert M.lafollette?

In the early 1900s, Wisconsin Senator Robert M. La Follette was most concerned with the issue of political corruption and the influence of corporate interests on government. He championed Progressive reforms aimed at increasing transparency, regulating monopolies, and empowering the electorate through initiatives like the direct primary. La Follette's advocacy for labor rights and social justice also reflected his commitment to addressing the needs of ordinary citizens against powerful economic entities. His efforts significantly shaped the Progressive movement in the United States.