What is the difference between La Raza and the Klu Klux Klan?

I was reading about how all these La Raza supporters are taking their students on school field trips to protest in Arizona, and say things like white people are frail, white racists. La Raza is not seen as racist by any means, so I am curious what makes them acceptable when the Klu Klux Klan or Nazis or similar factions are not.