"Muckracker" was a term used in the United States to describe American journalists who supported legal reforms in institutions (usually government institutions). They attacked these as ineffective or corrupt, and wanted to change the status quo. They would most likely write an article like this:
A tragedy that could have been prevented
We have learned about a terrible tragedy at the Triangle Shirtwaist Company factory in New York City. A great fire has burned the factory, killin 145 of its workers. However, we are not only sad, we are enraged. Our anger comes from the fact that the workers' death were entirely preventable. The deaths occurred because of a lack of safety features that could have protected the workers. The people responsible for this need to be brought to justice. Moreover, we need to demand action from the government. This tragedy demonstrates that factory workers continue to labor under dangerous and precarious conditions. This is particularly heartbreaking when we think of the number of women and immigrants who were likely in this group. If this tragedy makes you feel sad and angry, demand change from your local representative!