Question: What was William T. Anderson the leader of in the Centralia Massacre?
Sentence (from "Centralia massacre (Washington)"): This conflict between the American Legion and workers who were members of the Industrial Workers of the World (IWW or "Wobblies") resulted in six deaths, additional wounded, multiple prison terms, and an ongoing and especially bitter dispute over the motivations and events that precipitated the massacre.
Relevant evidence: No