in the earlier twentieth century , investigative journalists known as muckrackers revealed societal concerns ,corruption , and abuses of power. their efforts results in important modifications .Notable Muckrakers include upton sinclair , whose book the jungle exposed unsanitary conditions in the meatpacking industry ; Ida tarbell , who revealed standard oil unfair pratices ; lincoln steffens , who exposed municipal corruption ; and jacob riis , who highlighted poor living conditions in tenements . do you agree or disagree