As we all know, tons of celebrities participated in the “Ice Bucket Challenge” that raised millions for ALS research. Now Samuel L. Jackson has asked his fellow celebrities to use their fame to help with a cause close to his heart: racism.

Jackson has begun a musical protest against the killing of black people by white police officers — a campaign sparked by the recent deaths of young African-American men in Ferguson, Missouri; Cleveland, and New York City.

In a video message the actor posted on his Facebook page over the weekend, Jackson said, “All those 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.”

The Oscar nominee then launched into song:

“I can hear my neighbor crying, ‘I can’t breathe.’/ Now I’m in the struggle and I can’t leave/ Calling out the violence of the racist police./ We ain’t gonna stop, till people are free.”

The entertainer’s appeal to other famous folks came after a weekend of protests across the nation, specifically highlighting the recent deaths of Michael Brown and Eric Garner that did not bring grand jury indictments against the police officers involved in the cases.

Here’s the video: