Why isn't the Klu Klux Klan considered a terrorist group?

This is a question I always ask myself, when I see how Hamas is decried as a genuine terrorist organization. 

According to Wikipedia, the Ku Klux Klan (KKK), is an American white supremacist terrorist hate group whose primary targets are African Americans as well as Jews, immigrants, leftists, homosexuals, Catholics, Muslims, and atheists. This means that I’m one of its potential targets. 

The KKK was formed on December 24,1865 and has terrorized American citizens for the color of their skin and their views ever since, lynching close to 5,000 individuals according to the Tuskeegee Institute. 

Without a question if fits the criteria of a terrorist group that uses of violence and intimidation in pursuit of political aims. If ISIS or even Hamas are labeled a terrorist group for their acts, then surely the KKK fall into that category. 

The KKK does not care to publicize its actions and the police don’t seem motivated in investigating it, further its members can be found in in many forms of our government and it’s fair to conclude with certainty that the KKK is the best example of a modern terrorist group. 

So why is it not considered as such? Simply because we still are a nation of hypocrites.