When a celebrity like Samuel L. Jackson puts this out there, you know it's going to go big.

On the murders of African-Americans by cops, this man is clear. And it's about to go super-viral.

<span class="redactor-invisible-space"></span>

He starts off with these words: "All you celebrities out there who poured ice water on your head, here's a chance to do something else. I challenge all of you to sing the 'We Ain't Gonna Stop, Till People Are Free' song. Here we go."

"I can hear my neighbor cryin', 'I can't breathe.'
Now I'm in the struggle, and I can't leave.
Callin' out the violence of the racist police.
We ain't gonna stop, till people are free.
We ain't gonna stop, till people are free."