Los Angeles: 'Pulp Fiction' star Samuel L. Jackson has challenged his fellow celebrities to participate in an ALS Ice Bucket Challenge-style challenge to show their anger over two controversial police killings in the US.


Samuel L. Jackson. Pic/AFP 

The 65-year-old wants stars to join him in singing a track called "We Ain't Gonna Stop Till People are Free", inspired by the death of Eric Garner, who was apparently placed in a chokehold by a cop in New York when he was arrested for illegally selling cigarettes, reports contactmusic.com.