Here, from the ACLU blog. An excerpt:
Think of a vile name that you were called by bullies at school based on your religion, your race, your country of origin, or some other characteristic. How did it make you feel? If I call you by the same name but tell you that my intention is to honor you by using it, will you feel honored just because I say so, or would you suggest that I find another way to show my appreciation?
“Redskin” is a vile name. It’s a name that people who hate American Indians often call them. Every dictionary defines “Redskins” as being offensive, derogatory and a racial epithet. Even with the best intentions, naming a sports team the New York Kikes, the Seattle Slant Eyes, the Atlanta Niggers, or the Washington Redskins will likely offend the very group you want to honor. And they’re the ones who should know if the name is an honor or not.
The ACLU is a champion of free speech. The issue here isn’t whether Dan Snyder, the owner of the Washington Redskins has a right to call his team anything he wants. He does. The issue is whether he should perpetuate racism.