An organization dedicated to bringing attention to police brutality will participate in a national day of protest Saturday afternoon in Downtown Los Angeles.

Participants for the October 22 Coalition’s Protest to Stop Police Brutality, Representation and the Criminalization of a Generation will gather at 1 p.m. at Pershing Square. An hour later, participants will march to MacArthur Park and hold a rally followed by a vigil for victims of the alleged brutality.

According to the group’s flyer, minority groups, including Black and Latino neighborhoods, the poor and the mentally challenged, have been subject to police harassment and brutality.

The group cites stories of police brutality throughout the nation, including the recent death of Fullerton homeless man Kelly Thomas. Thomas’ case is being investigated after he was beaten by police and died after a five-day coma.

Another incident the group is trying to shed light on is the 2009 death of Oscar Grant.

As Grant was lying face down on the ground, he was fatally shot by an Oakland police officer who testified that he mistook his firearm for an electronic Taser, according to the Los Angeles Times. The officer, Johannes Mehserle, resigned a week after the shooting and was convicted of involuntary manslaughter in July 2010.

“These vicious attacks are not going down without opposition,” the October 22 Coalition’s flyer read. “The violence of the cops, the courts, the FBI, La Migra, and Homeland Security is intensifying. Our resistance must intensify as well.”