Memory Game MuckrakersOnline version Memory Game by Jefferson County ESC Upton Sinclair she exposed the business practices of the head of industrial mogul John D. Rockefeller Muckrakers Ida Tarbell he published his most well-known work “The Jungle,” Term used to describe the investigative journalists of the early 1900s who exposed many problems and issues in urban America. Jacob Riis first to write about the conditions of the urban poor, and eventually photographing them