Oscar-winning director Quentin Tarantino was among hundreds of people from across the United States who marched in New York on Saturday against perceived police brutality.
Campaigners say that police unfairly profile black and Latino men, and criticize what they see as the militarization of law enforcement forces in the US.
"This is not being dealt with in anyway at all. That's why we are out here. If it was being dealt with, then these murdering cops would be in jail or at least be facing charges," said Tarantino, whose hit films include "Reservoir Dogs" and "Pulp Fiction."
Tarantino had similarly joined activists in New York's Times Square on Thursday to launch a fresh push -- dubbed #RiseUpOctober -- demanding an end to police killings.
People who said they had lost family members at the hands of police are participating in the movement for change.
"This is a big progress. This is just amazing to me and I hope we will organize more rallies in honor of all victims of police brutality," Chicago-based Precious Edwards, 18, told AFP.
Edwards is the sister of Dakota Bright, 15, shot dead by Chicago police in November 2012.
"I hope that everyone, not only black and brown people, but purple or blue people, everybody stands up," she added.
A database compiled by the Guardian newspaper says nearly 930 people have been killed by police in the United States so far this year.