There are idiots like this in every fan base, I know. I even recall some of the horribly racist letters the Fab Five received from so-called "Michigan fans." But this is pretty over the top, both racist and threatening violence. Here is the content of the letter, editing out the obvious worst part:
“You suck as a coach! You’re a n—– and can’t win! Please get lost! Or else.”
Hey folks, we all love football. But it's a game, played by
kids young men. Let's cut this shit out.