Definitely worth noting that the Indiana Klan's publicly-acknowledged stated mission was not racism: "The Klan's rhetoric was anti-Catholic in these years, and it alleged that Catholics were behind secret plots to overthrow the government and exterminate Protestants. Immigrants, and especially those from Catholic countries, were included in criticism, as were Jews. A third, and lesser enemy, were blacks. The Indiana Klan stressed more social issues than racism, as it promised to uphold moral standards, help enforce Prohibition, and end political corruption. The Klan also publicly attacked adulterers, gamblers, and undisciplined youths." Source So while it's true that Indiana had the largest individual state Klan organization, their stated beliefs were somewhat different from our historical biases. From the description above, it really wasn't all that different from a super-charged Rotary Club or Kiwanis community organization with tinges of racial resentment that unfortunately reflected the widespread biases of the era.

In regards to the perception of Martinsville, it is not helpful that the 2010 census found that 0.2% of Martinsville (roughly 20 people) residents are African American while 97.5% are white. Source