Much like the "Ice Bucket Challenge," Samuel L. Jackson has called upon his fellow celebrity figures to join the current movement to raise awareness about the actions of "racist police" throughout the United States.  Jackson posted a short video of himself issuing the challenge to his famous peers to sing the "We Ain't Gonna Stop 'Til People Are Free" song.  In its lyrics, Jackson specifically calls out "violence of the racist police."

Check out his challenge above.  Lets see if any other celebrity figures join the movement.