A number of police were and I'd assume still are in some way members. So much so that a law had to be passed "preventing" police from being active members. David Duke is a great example of the ties to the power structure in that respect. Also it was started by former Confederate soldiers. They use(d) violence in the form of what we now call terrorist tactics to carry out their agenda. So they are certainly worthy of an entirely equal response even to this day if you ask me.

Maybe they aren't the best example in this case. Going after say Walt Disney, Warner Brothers, or better yet Robert Crumb or Will Eisner would be more appropriate comparisons.