<Ul> <Li> Arts </Li> <Li> Business </Li> <Li> Data </Li> <Li> Entertainment </Li> <Li> Environment </Li> <Li> Fashion </Li> <Li> Medicine </Li> <Li> Politics </Li> <Li> Science </Li> <Li> Sports </Li> <Li> Technology </Li> <Li> Trade </Li> <Li> Traffic </Li> <Li> Weather </Li> <Li> World </Li> </Ul> <Tr> <Th> Genres </Th> </Tr> <Tr> <Td> <Ul> <Li> Advocacy </Li> <Li> Analytic </Li> <Li> Blogging </Li> <Li> Broadcast </Li> <Li> Citizen </Li> <Li> Civic </Li> <Li> Collaborative </Li> <Li> Comics - based </Li> <Li> Community </Li> <Li> Data </Li> <Li> Database </Li> <Li> Gonzo </Li> <Li> Immersion </Li> <Li> Interpretive </Li> <Li> Investigative </Li> <Li> Literary </Li> <Li> Muckraking </Li> <Li> Narrative </Li> <Li> "New Journalism" </Li> <Li> Non-profit </Li> <Li> Online </Li> <Li> Opinion </Li> <Li> Peace </Li> <Li> Photojournalism </Li> <Li> Scientific </Li> <Li> Sensor </Li> <Li> Underground </Li> <Li> Visual </Li> <Li> Watchdog </Li> </Ul> </Td> </Tr> <Ul> <Li> Advocacy </Li> <Li> Analytic </Li> <Li> Blogging </Li> <Li> Broadcast </Li> <Li> Citizen </Li> <Li> Civic </Li> <Li> Collaborative </Li> <Li> Comics - based </Li> <Li> Community </Li> <Li> Data </Li> <Li> Database </Li> <Li> Gonzo </Li> <Li> Immersion </Li> <Li> Interpretive </Li> <Li> Investigative </Li> <Li> Literary </Li> <Li> Muckraking </Li> <Li> Narrative </Li> <Li> "New Journalism" </Li> <Li> Non-profit </Li> <Li> Online </Li> <Li> Opinion </Li> <Li> Peace </Li> <Li> Photojournalism </Li> <Li> Scientific </Li> <Li> Sensor </Li> <Li> Underground </Li> <Li> Visual </Li> <Li> Watchdog </Li> </Ul>

Who are muckrakers and what did they do