Over the summer, celebrities participated in the ALS Ice Bucket Challenge to raise awareness of the deadly illness known as Lou Gehrig’s disease.

Now, actor Samuel L. Jackson is calling on those same celebrities to speak out against another worthy cause: police brutality. 

Jackson took to YouTube to share his challenge with the masses on Saturday.

Watch Samuel L. Jackson call on celebrities to fight for justice:

Mr. Jackson, thank you for standing up for justice.

Sound off below!